They definitely thought about it, but fingerprinting is already so easy, and really difficult to stop even if you started the web platform from scratch. Nobody is going to accept "websites can't play any audio because it would make fingerprinting sliiiiiightly easier".
Maybe I'm an extreme outlier, but I don't want 99.99% of websites to be able to make any noise at all. And for the remaining ones I could live without audio too.