Safari supports multiple user profiles because it’s running on a Unix operating system that provides full user accounts.
If you’re switching browser because google is breaking ad blocking, it absolutely makes sense to switch to one with a blocking technology that the browser vendor specifically added, rather than grudgingly allowed.
It also makes sense to use a browser where the blockers don’t get access to what you’re actually browsing. What’s the point of blocking trackers if the blocker just tracks what you do?
Unless you want to log out and into another mac account just to change profiles, this really isn't useful.
The utility comes from having multiple sandboxed, separate profiles running at the same time with separate cookie jars, in separate memory spaces. Kind of like docker containers for the browser. Chrome does this magnificently--I have personal, school, and work profiles all running and open at the same time. It's very useful if you have multiple accounts on any services and need access to them simultaneously (i.e. multiple google accounts). Also useful if you don't want the browser in one of the profiles to remember any sites/cookies from another area of your life. I wouldn't want some of sites I visit on my own time to autocomplete at work, but I still want to have it when I go home.
As far as I know it also isn't possible to make any sort of CLI incantation to open the safari binary as a different user (like sudo with specifying a different non-root user) and not have it override whatever is currently running.
If you’re switching browser because google is breaking ad blocking, it absolutely makes sense to switch to one with a blocking technology that the browser vendor specifically added, rather than grudgingly allowed.
It also makes sense to use a browser where the blockers don’t get access to what you’re actually browsing. What’s the point of blocking trackers if the blocker just tracks what you do?