not saying to get advice from the internet, just sharing a readily-available source that’s quite reliable and is consistent with precisely the advice I’ve personally received from professionals IRL
the guy himself is a physical therapist but whatever, be as condescending as you want to be
it doesn’t. it just removes pressure from your lower back
see above, you’re using a tool that removes/facilitates the force imposed on your lower back in a given lift and this has the disadvantage of not progressing the strenght on that part of the body at the same rhythm as your other muscles you’re engaging in the lift
honestly if you’re not competing there’s virtually no reason to use a lifting belt, egolifting is a thing and something that everyone lifting recreationally should not engage in