Management has explicitly taken advantage of this by booking a lot of recurring meetings that start 8/8:15/8:30am in the morning when in the "before times" it was generally a 9am start. Management also feels comfortable sending Slack DMs at 6-7pm as well, knowing people aren't commuting so they can get an answer.
Regardless of setting boundaries, the noise just starts earlier and ends later.
That said it's a tough trade off for me because I do greatly prefer WFH and find I am handling a much higher workload stress only because I am at home.
I've told my manager multiple times over the last year that the level of meetings/work we are taking on is only sustainable because we are at home and everyones social lives evaporated for a year, to which he largely agrees.
What they expect when people return to office shall be interesting. Unless they are ready to accept the 20% reduction in task completion as we revert to in-office norms, I'll be moving on to a new firm after bonus time.