Yes, anything can be done too much, or done unsafely. But...
2020: Kids are on their phones too much!
2010: Kids are on the internet too much!
2000: Kids are on their Nintendos too much!
1980: Kids watch TV too much!
1930: Kids listen to the radio too much!
1870: Kids read too much!
https://news.illinois.edu/view/6367/806289
https://archive.nytimes.com/op-talk.blogs.nytimes.com/2014/09/14/when-novels-were-bad-for-you/