Blocking subreddits is still possible with just the webpage btw. Go into the sub, click the 3 dots up top, choose "mute subreddit".

I do the same as you. If any post is harming my mental health, I just must the entire sub. But then weirder and weirder stuff just keeps surfacing. Some of it is funny though; like it keeps showing me alien subreddits now, which I find funny because I'm pretty sure 65% of the comments are just satire.