IAM shouldn't be a thing to learn. It's account management, default and easy to access options should be sane enough for most people to use. At big companies, sure someone has it as a dedicated part of their job description. But if you're in the majority of smaller companies, ones maybe that's just doing e-commerce and tech isn't their core skill set, account settings should be near invisible and still be trustworthy. It's not the Slacks of the world that have an issue with this, but the long tail of the world we now live in that software has eaten and companies are just scrambling to exist in it. Flutter integration is not in the list of concerns of this long tail.

And telling them to "just learn it" isn't the customer focused mindset, it's the engineering one.