Wow, lots to unpack here. First off, MAs are not remotely comparable to PAs or physicians. MAs typically earn a certificate, and salary is 20-30k. They are typically office or clerical workers with a medical support role. They are not diagnosticians or prescribers, like physicians, PAs, or NPs are. So talk of MAs 'practicing medicine' is weird, they don't, that's not the job role. We need them, they aren't well paid... nice work punching down there mate.
Frankly, this comment just sounds like you have an axe to grind with PAs. (Hence conflating MAs with PAs.)
PA is a Master's degree. They diagnose, treat, and prescribe. Unlike MDs, who are board-certified independent practitioners, PAs are not trained to work independently but as part of a team. In some cases that means they function as physician extenders, freeing up physicians to focus on more complicated cases. In other areas they focus on tasks delegated to them, for example central lines or other procedures, wound care. Some are used as First Assists in surgery, others are used for pre and postsurgical care, which helps surgeons do more surgeries. In any case, while the roles for physicians and PAs are much more similar, the condescension remains in your comment.
Punching down on MAs is inconceivably poor form. Punching down on PAs is still bad. Conflating the two gives away your game. You suggest harm... have any evidence to back this up?
Hint: you won't find any. There aren't a ton of studies, and quality could be better, but mid-levels (NPs and PAs) who stay within their roles have comparable outcomes to physician colleagues. How can this be, given the difference in training time? Easy. The roles are different. The subset of pts managed by PAs/NPs is different than MDs, because professionals consult and transfer care when appropriate. It's no different than a family practitioner or hospitalist consulting specialists. Nobody does everything, healthcare is a team effort.
Trash talking other professions, especially without evidence, is unprofessional.