As far as I know there are still some things "the platform" actually won't deliver; for instance I'm fairly certain there's no searchable combobox that's fully accessible. One ~must leave the platform to give users the experience the expect.

That means "the platform" itself is actually teaching people to work "off platform" and arguably will always have gaps as functionality and expectations evolve.

Admittedly, the habit really ought to be 'I need to make a combobox -> does the platform have what I need? -> Research, evaluate, test -> Otherwise, make it' but I don't begrudge people for skipping the middle steps.