The UI of Youtube is actually not bad. What is bad is how the search function has gone to shit, constant promotion of youtube Shorts taking up half the screen, and the algorithm getting steadily worse at recommending videos.
The interface itself is pretty easy to navigate.
imo loading several video recommendations while im just scrolling through comments is very bad, especially because the API calls are seperate and load both sides seperately. huge waste of bandwith when im only interested in the text, which is barely any bandwidth
Youtube 2012 loaded in 1 second on a 5MBit line. HTML, CSS and JS for a page was a few hundred kilobytes.
You can profile the current "responsive" version in your browser. It might not look horrible but it's a technical abomination. I doubt it'll even load anymore in a browser from 2012.
No? That would be true if we were the Twitter community. But, for Lemmy, I am pretty sure most people that are on Lemmy fancy Reddit's outdated old.reddit.com UI as well because it's more simple. Things are much lighter, but still work.
I do feel like the mobile app has been getting progressively buggier over the last year. Maybe it's just me but the mini-player has been glitching out for months and other weird stuff has been getting more prevalent like yesterday I had the YouTube play button icon stretched and distorted as an overly across the whole app until I restarted it and creating a queue didn't work until I started a new video manually.