Most engineers are not qualified to build an app without a framework with an architecture that is well thought out and code that is well written and documented.

Most engineers are not qualified to build an app without a framework with an architecture that is well thought out and code that is well written and documented. I've never seen a custom framework meet any of these requirements. I've never seen one with proper documentation. Sure, if you want your colleagues to hate you and think of you as an idiot junior coder who shouldn't be in this business, write your own framework from scratch instead of actually doing something to move the business forward. A competent manager would fire such a stupid engineer for not contributing to the company and wasting its time not just in developing garbage but possibly many years into the future if the rest of the team is dumb enough to use said garbage.