tbh i don't really care about ar as long as it's not far over 10. but i usually play nomod anyways so that's not a problem.
i think more of it as it has to fit? slow sections with ar 10 are horrible. lots of overlaps and ar8 are a horror (e.g. kuroko diff on monstrata's can do map while i do appreciate it as a gimmick). but if you utilize ar 8 like lots of old mappers did it, e.g. shinxyn, it becomes great. when you utilize ar10 with a very fast paced and modern map, like illness lilin (by kroytz), it becomes great. and if it's a 1* easy map then ar1 or ar2 may fit it and everyone will be able to play it regardless of its ar as long as the ar fits it. no need to view it so static.