Yep. If you're getting paid to maintain even 10-20 UI's, frameworks help preserve your sanity. At least you'll know what to expect from the boilerplate and wh

Yep. If you're getting paid to maintain even 10-20 UI's, frameworks help preserve your sanity. At least you'll know what to expect from the boilerplate and what are the general capabilities of dozens of apps, just by learning 1 framework. And the more popular the framework, the easier it is to hire new developers to work on your apps.