FWIW I run 7.5.5 on my SE/30 with 8MB fairly often semi inadvertently, because for a long time I was running without a PRAM battery and it kept losing the 32 bit addressing setting even though I have 128MB in there ... anyway for most things it’s really fine. WriteNow, SuperPaint, basically all black and white games. Just don’t try to run 4 apps at once and it’s entirely usable and pleasant.