Using a walker or not?

I took child development classes in college & they said walkers can delay walking/muscle mass plus are just dangerous.

I never wanted to use one but now my mil and my mom are determined I should & are saying “if they are so dangerous why are they still sold in stores?”

Which technically is a good point & made me curious why they still are? I’m still against walkers as my baby is 7m and just getting the hang of army crawling/rolling

Any opinions? Do you guys use walkers? Or no?