To an extent I disagree. Yes, drawing diagrams can be useful, but simply solving lots of problems is honestly the best way to learn maths. I also much prefer reading from a physical book. Im not sure simple animations will improve things massively.

I don't mind if a book skips some details and I have to fill it in myself, for example drawing a diagram to help understand a key point.

Perhaps in school most people treat maths more mechanically, and exploring requires more mathematical maturity. I don't think some basic animations will improve that directly.

That being said, people like 3b1b on YouTube are in the intersection of people who can animate and know the maths. They certainly produce things which spark the imagination.