Since launch "new reddit" has been broken to the point where the page crashes if you copy and paste text in the comment textarea. You need a hard reload of the page to restore it, and then you lose your comment.
It's been what, 5 years now? I think it's safe to assume that nobody working on reddit's UX actually uses new reddit, and also most likely nobody else either.
The ability to edit text isn't a weird niche feature for powerusers. It's fairly central to using the service. Anyone who does more than passively scroll down the front page will run into this.
It's not because the issue hasn't been reported either. https://www.reddit.com/r/bugs/search/?q=paste&restrict_sr=1
The SerenityOS guy will soon have built a fully functional web browser rendering engine in less time it's taken Reddit to restore the default functionality of a textarea tag. It's unbelievable.