I see many people in shorts and sandals,
Sacrosanctum Concilium was decided on December 4th, 1963, and life in general was more formal 57 years ago than it is today; 57 years is a long time in terms of formal/informal dress. There was no such thing as “work casual” in the cities. And the Catholic Church had zero, zip, nada to do with how people dress generally.
It appears that shorts and sandals offends you, and I am not a proponent of it; but I would rather see a parish filled to overflowing with people in shorts and sandals than I would a quarter full of people formally dressed.
At EF Mass I see people following along (or in my case, struggling to follow along) in their missals (I rarely see a missal at a Sunday OF Mass).
One of the reasons you fail to see missals at an OF (and in the parishes I have been to in the last 30 years, all have had missals in the pews) is that the Mass is in English and the priest most generally has a microphone. I don’t use a missal anymore as I can hear and follow along with each and every last word the priest says aloud. So I fail to see your point.
Granted it isn’t a fair comparison, generally people at EF Masses choose to be there rather than at an OF Mass in their own parish.
I will grant you it is not a fair comparison, and since we are on unfair comparisons, a Parish about 5 miles from me has The EF as well as the OF. They have over 3,000 families, and 11 Masses; 5 in English, 3 in Spanish, 1 in Vietnamese and one EF.
And the EF averages less than 100 people. Several of the other masses are standing room only. There are three other parishes surrounding the area within 5 miles or less, so it may well be that some of the fewer than 100 attending the EF come from other parishes - since none of them have an EF.
And as everyone generally can hear each and every word a priest says, presuming the audio is set up correctly, it just might be possible that people hearing the Mass in their own language might give you the feeling they are not actively participating, because they do not use the missals in the pews.
I suspect a bit to the contrary.