Assuming the ISPs equipment works correctly. AT&T fiber in the U.S. has apparently had issues for months with a few patches to stabilize things.

My Tp-Link Omada AP has better coverage and speed. I setup my parents up with edgerouterx and Tp-Link AP and it's been hands off for the last 1+ years.

If ISPs can actually offer decent equipment I think it's a win but that seems like more the exception than norm. Reasonably priced prosumer and small business equipment has been way more stable in my experience.