Why not? I have a bad back and just plan on using the smith machine until I feel comfortable enough doing weight squats and perfecting my form.
Man that shyt is bro science and it is echoed about every machine in the gym
Machines have a valuable place in weight trainer especially for a beginner or loner in the gym
No you wouldn't use a Smith machine to prepare for a weightlifting competition but, no one is here for that
It also takes some pressure off your back.
Until there is some empirical data out there that suggest the Smith machine hurts you in some way
keep doing what you are doing