That horrible "Neo" interface is a couple of years old now. Yahoo threw a spanner in the works alright, that was the beginning of the end. Prio to "Neo", Yahoo Groups was actually pretty useable. Wasn't difficult to search or find specific posts. Neo broke all that, and overnight it all became an unusable mess. I'm on more than a dozen, mostly model railroad related, though I only get email from about 5 of them. I rarely post because it's almost impossible. And not even WYSIWYG, in the editor box all you see is your text you've types, if you miss the little check box you end up quoting the full contents of EVERY post in the thread that came before your response. Horrible UI design.
Then they bring in an absolute boob to run the company - she might be pretty to look at but she has the business acumen of a rock. All of their news sources have turned into pure clickbait and downright malware links, it's all those sort of sites where a half page story is spread across 10 pages so they can present even more ads. They used to aggregate all the popular comics, they tossed that. Fine, no ad revenue for you, I get my Dilbert direct from the source now, let Scott Adams get the revenue to hits on his site.