> I too have seen the articles proclaiming that devs should stop implementing auth themselves > and instead use some Auth as a service product.

It's a moved goal post which sneakily tries to position itself on top of the old adage "never roll your own crypto". Problem is, that adage is really about security whereas "don't roll your own auth" is about not wanting to do a mostly boring part of your job. I'd take my hat off if they'd admit it, but it's much easier to get budget with potential security scares compared to "we don't wanna".