I disagree. See my previous post for my proof.
I would clarify this by saying that He could have created you and I with less or no concupiscence, and thus allowed us greater capability to freely choose to be and act holy.
That’s a valid point and may be true. Honestly, I’m not sure whether I believe it to be true or not, as I still haven’t fully figured out what defines “me” as “me”.
What makes me me is indeed not entirely simple, but my reasoning as relates to this topic is as follows: each person is associated with the collection of all things that they will ever be or do throughout their existence. This collection can be thought of the instantiation of the person into the world, and depends on their choices together with their surroundings.
In making a person more holy, God can do essentially three things: modify the surrounding factors to which the person reacts (something that it is commonly held that He does), directly change the choices we make/are capable of making (problematic with free will), change qualities about us while leaving us the same person (something that we say He does, with our cooperation and assent). Since God knows all the choices that we will make, He could also not create us, and create someone else who would freely choose better things in our place, but this would be problematic for reasons mentioned (and probably expanded upon later). Whatever makes me me, a change in me would involve a change in one of these areas - though perhaps certain changes would go too far and make me no longer me, whatever changes are possible while still being changes would fall in one of the three categories.
Changing surroundings in ways that don’t violate free will so as to optimize things is fairly uncontroversial. We also often speak of God helping us grow, so that the third happens is also uncontroversial. The second we pretty much say doesn’t happen, and the fourth I find problematic.
The question you seem to be raising here is something like “why doesn’t God create us with growth pre-done, as it were?” That is, why do we need to grow, why aren’t we made with better faculties that will help us do what is right?
I would propose a two-fold answer with a qualification. The qualification: some of our attributes are the results of our own choices (and our surroundings) and so there is a free will element involved. Of course, they aren’t all results of such, I just say this to point out that it might not be entirely simple to make such changes and maintain free will, though I accept that it is possible at least to some degree.
For the answer, there are two parts: first, even with no predisposition towards sin at all, sin is still possible. Even those with the greatest attributes can sin, and often sin worse than those with lesser gifts. Adam had no concupiscence, no inbuilt inclination to sin, but sinned anyway. Lucifer, whose name means something like “bringer of light,” was one of the greatest of angels, and fell very far indeed.
[More wild speculation warning.] For that matter, not only are greater attributes no guarantee of greater holiness, if we go back to the collection of all that we will do and decide associated with each person, and take into account that how I react in one case affects what else happens and so what else I react to, it may be that for a particular individual, if God were to freely give him (on top of his existence as a being already) greater gifts in any particular area, that these gifts would eventually lead to this person’s fall. Our existences are chaotic systems (in the technical sense that small changes in conditions at one point can result in large changes in future conditions) - we can imagine that a particular person would, if given more self control or similar, in the future succumb to pride at his holiness, which could be problematic directly, or cause him end up in situations he thinks he can handle but can’t, or any other number of things.
All of which is to say that giving us better abilities in certain areas is part of the optimization, and God is the only one who can see the results before they happen. So it could be that it is ultimately better for a person to have the abilities that he has, even if it is not better at a particular point in time. To be clear - I am not sure about this, but it seems plausible to say that while God does not hold back our growth, that He regulates when and how much to make it happen so as to help us as best is possible. But whether He does or not, the fact that less inclination to sin is not a complete guard against evil still applies.
And second, we’re back to the “things can always be better” issue. Other concerns aside, God could improve each of us as much as He likes, and we could always be better. In this way, we are on a journey of growth. We have to start somewhere, and where we are is good.
Jesus said “Be perfect, therefore, as your heavenly Father is perfect.” It is therefore possible for us to be perfect now that we have been redeemed but it is still only relative perfection because only God is perfect in every respect. We are also subject to temptation because we are not isolated individuals but members of a community who are deeply affected by the way others behave. Since God takes this into account we have good reason to believe no one is beyond redemption - which means He intervenes to prevent evil far more than we realise.