Unless you have a reason to, I wouldn’t recommend a secondary profile as a daily driver yet. SMS doesn’t work perfectly and plenty of other bugs I’ve noticed which sometimes you have to switch to the Owner profile to access certain things, and sometimes things just don’t work in secondary profiles.
That being said, I’ve made it work. If you have a reason to use this threat model then do it.
I’d say there’s a darn good point if Meta doesn’t want you to use one.
There used to be a great frontend for Instagram that was sued and forced to cease development when all it allowed you to do is browse Instagram on an account in this private frontend app.
EDIT: here it is https://austinhuang.me/barinsta.html
Mine started with some random guy posting a google doc about how to use uBlockOrigin to not only block ads but also to block 3rd party scripts & frames, and see what all your internet connected to.
After the paranoia set in from seeing just how many connections are made from every single click, I got intensely interested in how much more I could do to regain privacy. It’s been a very deep rabbit hole.
When I worked for a power utility, I got called out to inspect a boiling (yes, boiling) power transformer. A weed operation in a house served by the transformer was using so much power for such a long time in the heat of summer that the transformer was about to explode if we didn’t disconnect their power.
It turns out the grow op had illegally bypassed the meter too, so they weren’t paying for the power. Just goes to show there are valid reasons for doing this, even if it’s a bit excessive to report them to law enforcement directly.