I was definitely a better speller before smartphones, but I’m arguably still pretty good. It’s the predictive text that has seemingly gotten so much worse.
Discussion
I have predictive turned off. I’ve always found it incredibly annoying. What I’ve noticed is that auto correct is suggesting shit like this. 
Right like wtf is that? This has to be some woke shit to accommodate non standard english dialects
Found the source of the issue, for me at least..
Settings > General > Dictionary > deselect Apple Dictionary
It’s actively creating more errors than corrections nowadays.