No - mine is not a silly question. The CCC can and does instruct us and if something is ‘bad’ for us (has consequences/downsides) it can and would tell us and provide explantion(s).
Again, you cannot prove a negative, and the CCC doesn’t try to do that. For example: you will, of course, agree that the CCC teaches that the Trinity is an essential dogma of the Catholic Faith; so, if your demand is a reasonable one, then there must be a section in the CCC which warns us about the “downside” of not believing that God is Trinity, i.e., what the results will be if one fails to believe that God is Trinity, like the Jews and Muslims. So, where is it?
Neither the OP nor I have denied or failed to give assent to Marian Doctrine nor anything regarding the liturgy or history of the Church.
I’m aware of that; but, in giving assent to the liturgy of the Church, you admit that devotion to Mary is a good, and holy, and recommended thing. Since it is so, why set aside or avoid something that is holy or recommended by the Church?
Nothing is demanded regarding personal devotion by the Church.
True. But, why should the Church have to “demand” that you do something good and holy? In a family, does a parent only wish the children to do what the parent “demands,” or should the relationship be deeper and richer than that? Shouldn’t the parent expect the children to follow his example, and shares his likes and practices, and recommendations? In reducing everything to what the Church “demands” from you, you are approaching the Apostolic Faith like some legalistic exercise and not appreciating its fullness and richness and depth. That is very sad and unfortunate.
Personal devotion may or may not follow giving assent to this doctrine.
You’re correct; and no one is saying that a Catholic must have personal devotion to Mary. There may be all sorts of good reasons (that is, understandable reasons) why a Catholic neglects to develop a personal relationship with Mary. The Catholic may have psychological or cultural obstacles that prevent him from developing such a devotion. Perhaps he had serious problems with his own earthly mother while growing up, and so can’t relate to a maternal figure; perhaps he’s what modern psychology calls a sex addict (or just preoccupied with sex), and so can only view a woman in a sexual way; or perhaps the cultural trappings of Marian devotion (as traditionally expressed in European or Latin American culture) are seen as something alienating, or childish, or just “not for him.” This is all possible.
But, what I’m saying is that this point of view and mentality, while permitted by the Church (because of the kind of understandable reasons listed above) does not reflect the real mind of the Church, but is merely tolerated and indulged by the Church for the sake of those who might have these personal, or psychological, or cultural obstacles. If it were otherwise, then Marian devotion would not have a place in our public Liturgy, which is does. So, this is an important distinction, and I would encourage you to consider it. In promoting personal Marian devotion, the Church holds out an incredibly valuable good that it would like all of us to have. Granted, some Catholics may not be able or well-suited to appreciate or accept this good; and the Church makes allowances for that. But, that doesn’t mean that the lack of personal Marian devotion is “equally Catholic” to the possession of it; the latter is what the Church would have you have and the former is what the Church allows for those who might not be ready or able to do otherwise.
As St. Paul says to the Corinthians, he fed them on milk because they were not ready for solid food. A deep appreciation of Marian theology, which leads naturally and necessarily to personal Marian devotion, is part of the “solid food” of the Catholic Church. The fact that some people are content with mere “milk” is tolerated and understandable. One can survive on “milk” just as easily as one can on "solid food; “ but, what I wish to impress on you is that an
entire banquet has been served for you, and God and His Church want you to
enjoy all the numerous delicious tastes of the “delicacies” that the Catholic Church has to offer. If you just want to sit at the banquet and drink milk, that’s fine. You’re certainly still welcome at the table and no one will say that you are not with us. But, there are plenty of other things to “eat” here, and the intention of the Church is that you should enjoy them and benefit from them. Otherwise, the Church wouldn’t serve them to you. I urge you, please, to think about this and ponder it prayerfully.