The prevalence of touchscreens has probably resulted in a decrease in average fingernail length
I feel like I used to see a lot of women with super long nails struggling to use their touchscreen phones. I'm sure at least some of them have chosen slightly shorter nails to make it easier.
Ironically, I can almost type as fast on my phone (102 WPM PB) as I can on most keyboards (110 WPM PB), and that's with my weird improper method of touch typing. These scores are for the 15 second word test on MonkeyType.
But I would assume you're used to using a 'manual' keyboard whereas if you only grew up on touchscreens its probably more difficult to get familiar to.
thing is, for my dialect of German, autocorrect is less than useful, so for me, typing Bavarian on a phone keyboard is certainly the fastest at around 150 wpm, trumping english or german on any other board, probably because it exactly matches the way I speak and I've been doing it for 13 years