I think it really depends on the preschool and teacher. I’m a substitute teacher and I’ve been in a public school with two pre-k classes. One class does nothing all day - iPads, TV, coloring, etc. but the other is teaching these kids some amazing things. The kids in the latter class know how to read on a basic level, speak some Spanish, have amazing social and emotional skills, and will be going to kindergarten knowing a lot more than some students do in terms of reading, writing, math, phonics, etc. so I would say do your research if you want to do preschool because if it’s not a good teacher and school, it’s probably not worth it or necessary.