Even if I personally agree with you, this is a very tricky topic. Especially for Spencer. He is very secretive and keeps his feelings to himself and does not show it to the public, right? So it's hard for us to judge where facial expressions should be and where they shouldn't be. Although many "people" do not share our point of view, I think this is a common problem for all routes. Unfortunately, I do not see an easy and quick solution to this problem. Even feedback will be useless (mean the report of specific scenes), because how many such scenes will there be per route? Hundreds? Thousands? Fixing everything will take months of hard work. 
Maybe Dyne will return to this after completing the main routes. The only thing available to us for now is imagination! When we read a book, we don't see facial expressions, right?
So why not use this practice here as well? That will give us numerous facial expressions of any kind we want!