In any engineering profession there are many ways to skin a cat.
And all of them involve trade-offs.
In a medical profession there are many ways to fix the cat that has been skinned.
And all of them involve trade-offs.
In piloting a plane there are many ways…
okay, this is where my analogy breaks down.
But it is the same principle.
But the point is, there might be many ways to do something with a cat.
And they all involve trade-offs.
A formal education and training will bring you up to speed on those ways and means and the trade-offs involved.
If however your entire profession is based on nothing more than “how you feel” (not how someone else feels because we call that psychology) or “what I reckon” that is the metaphorical equivalent of a few guys gathered around a bar having a talk over a few beers, then I am adamant that you do not need a formal education in whatever it is.
And anybody demanding you have a formal education in whatever it is, is either trying to sell you that education at an inflated price, or they are taking the easy (protectionist) option of demanding a credential that somehow is supposed to validate “how you feel.”
Beware the person who exclaims “I am absolved of all responsibility of the professional misdeeds of this employee because I verified they had the required certificate/credential.”