How much of that is going on though. Most of the contributors to those subjects have left years ago.
there are still a number of fairly busy forums outside of the politics adjacent ones - Bargains, Cycling, Transport/Infrastructure, Motors, Gigs, TV are amongst the forums I visit regularly and have good, Ireland-focussed discussions you wouldn't necessarily get on Reddit, and I'm sure there are others in topics I'm not that interested in.
There are also a lot of moribund forums that could be archived and removed from the main menu to simplify the structure. The likes of CA and AH require a lot of moderation and are replicated elsewhere (AH is much the same as r/Ireland IMO) so I don't think they'd be any great loss.