I don't see much issue with FLINTA spaces, other than it still failing at the ye old question "how to easily filter bad people from people". The options for regular spaces are still HUGE, some people deciding to have FLINTA and apparently enjoying themselves is a plus.
Having lived in Berlin, FLINTA only apartments are a significant minority (up to half) of spaces seeking housemates through publicaly available groups on platforms like Facebook (as opposed to websites like WG-Gesucht). So there's quite a significant material impact. Living in Ireland currently, more and more arts workshops, funding opportunities, arts mixers and the like are FLINTA only or FLINTA preferred (terminology can differ). Ditto club nights, but that's whatever. This is a real and growing issue if you're not a member of the approved groups, but have to function in those environments.