In my view this is partly because of the 'focus' (or lack thereof) of the education system and partly because most software is developed in English first with the addition of accents an add-on, which makes typing accents cumbersome and thus the path of least resistance is to give up, especially when writing casually.
As of right now I'm on a mac and I feel very comfortable with the way they've designed input for "roman accented" letters (using the option key, or for some using long presses) but it's a whole other thing once I see a Windows computer.
I'll keep it in mind if I end up making myself a desktop PC in the future. But I guess the hardest part about any good alternative design isn't so much the design itself but its adoption and how often you're interacting with it to rewire your brain.
You can use QWERTY with accents very easily with "International keyboard with dead keys"[1]. You can configure OS to switch keyboard with Alt+Shift to have the regular QWERTY and the International-QWERTY when you need it.
[1] https://web.cortland.edu/ponterior/keyboard/#:~:text=The%20U....