No it’s not. Unlearning old habits and thought processes is always the first step in learning new things. But to be fair, it’s also the most difficult part.
While other CAD packages do have a better failure path to follow, they still can fail at the same points as FreeCAD. And you still really should be following best practices for ANY CAD package to avoid failures. But people are nothing if not lazy. And fillets and chamfers just suck in any CAD package. It’s always been my practice to never add them until I was done with the modeling. And if major changes where needed, I would remove them if I suspected they could even remotely cause an issue during a change to a model.
I never have an issue with people preferring a different CAD package over another. For example: I detest Fusion 360 for various reasons even after spending a year with it. We all have preferences, work requirements, and even “vibe” better with one package over the rest. You need to choose the tool that works best for you.
What I do have an issue with is new users that try and have problems and immediately start whinging that “FreeCAD isn’t like what I know. And it needs to be like my favorite” Those are the lazy people that can’t be bothered to learn something new. And they should either expend the effort to learn or go back to whatever they were using or volunteer to code, (it’s open source after all). FreeCAD ain’t for you.
But if you have given FreeCAD, (or ANYTHING new in life), an honest try and you can’t get the hang of it or simply don’t like it. Well, that’s a valid and very fair reason to not use it.