It is burdensome to verify, but once you're past that hurdle, it's absolutely smooth sailing. I don't know which sites or apps you used, but the ones I know of all have an excellent UI.

The website and app UIs for these services weren't my problem, it's the overall UX and KYC is part of that.

I don't want to go over all the issues I had, but to put it simply some were the fault of the service (I had major issues verifying and then reverifying) and some were due to the bank I use and their restrictions.