So far I have not encountered any problems with e.g. desktop Firefox (no surprise, gecko has been running on Android for ages) and various server things (mostly the BEAM.. and even some Haskell, even though before 8.8 GHC did not put proper memory barriers everywhere, and I used 8.6 back when I compiled the app).

Most libraries and applications use stuff like mutexes, btw :) it's not like people who don't care about memory models try to make lockfree things often.