I understand the reason given for the change during a recent AtS was that videos can't autoplay unless they start muted.
Lanzer
There had been a couple of changes on Chrome and Firefox, and autoplay is prohibited unless the video is set on mute. It's unfortunate that this is out of our control. I guess enough people complained to Google about autoplay that they changed the requirement.
For anyone who doesn't know yet, between last and this year, major browsers implemented new policies to manage how media plays.
These new policies finally transferred control of media away from websites and into the browser, and work the following way:
Media that starts with sound will be automatically paused.
Media that starts with sound is allowed once toggled on.
Media that starts muted will be allowed on desktop.
Users can indicate per-site what they want.
Firefox and Chrome do differ a lot in the specific implementation, with Firefox's being vastly superior, but broadly they're similar.
The point is that while what Lanzer said is true, it isn't the entire story; users CAN enable autoplay with sound if they want it.
So, with that being the premise of the change, here is why reverting it would be a perfectly fine and preferable thing to do:
Currently we have the situation where media plays automatically but silently (muted autoplay always allowed).
If you liked profile music, now you have to unmute the video and seek back to the start to listen.
If you have limited data and are on a desktop platform, this is wasting your data.
If the change is reverted, we'll go back to the situation where media does not play (media with sound paused).
If you like profile music, now you can either turn autoplay on in your browser, or press only the play button.
If you have limited data and are on a desktop platform, this saves your data.
In both cases, the sound will not start playing unless you have allowed it, as was the point of the policy changes in the first place. However, reverting the change to mandatory mute will give the user control of their autoplay preference back, which would remove some annoyances this introduced to a subset of users, while not affecting anyone who doesn't otherwise care how it works beyond not wanting to hear surprise music.