I, too, agree reading comprehension skills have declined in recent years. I also feel, with almost painful regret, that the art of discussion - never mind actual debate - is becoming a rare skill. Twitterisation encapsulates this perfectly, imo.
Fuck knows how bad this'll get when the entire internet is reposting stuff we get from chatbots, which get their stuff from the internet, which consists of stuff humans rehashed from stuff they got from chatbots ... Everything will end up originating from before the 2020s! It'll get more and more normal to simply state the same received opinion on repeat. That used to be a fairly reliable indicator of low intelligence but now we see intelligent, educated people doing it. Exploratory discussion's my favourite hobby (especially with a good dinner), seemingly limping towards a quiet death.
Quite a lot of derailment is now, I think, symptomatic of this. Sometimes it seems to come from genuine stupidity and/or inflexible thought. Other times it seems to be some twat coming here to shout us down, exactly like a typed version of those chanting TRAs trying to disrupt women's meetings. I think this has increased exponentially over the past ten years.
What hasn't altered much is the sealioning and - my second pet annoyance - posters who pair up to argue against one another, disregarding the topic of the thread and any other replies. In a real-life group, the two would be physically edged out so everyone else could carry on without them. The only online equivalent is to ignore them, quoting a relevant post from before they started, but it's far less effective because readers have to scroll through their tedious spat.
Wrt to the purposes of the FWR boards, I don't see them as being for the exclusive use of feminist sex realists. You never get an informed view by restricting your exposure to those who agree with you. For sure, it gets boring to keep being asked Feminism 101 questions or why TW are not W. Previous posters have helpfully made threads to explain, to which questioners may be redirected. Should they keep asking anyway - they're reportable.
It's perhaps worth mentioning that some well-informed people with valuable views are just as prone to inflexible communication as thick people. Having previously wasted too much time, effort and emotion on trying discuss (not simply agree) with them, I've concluded they're worth reading but saving any dispute for another thread, or starting one.