It's a start. Allowing users to disable autoplay altogether would be better, but shutting down the audio is better than nothing. It's a shame that browsers increasingly have to actively defend against website behavior, instead of just being tools for displaying those websites; but, well, here we are.
Autoplay music was in for a while, went out, then came back in, from what I recall: Back in the 1990s, it was MIDI files on the stereotypical Geocities page, or completely hand-made pages, and that went out in a massive design backlash against those kinds of sites. Now, it's coming back in the form of autoplay video on news sites, for example, which would have been impossible in the dial-up era. So this isn't a new t…
(I've never used the phrases "rose-colored nostalgia" and "MySpace" in such close proximity before)