For 90% of SWEs (and closer to 99% of anyone doing front-end web stuff) it really isn't that custom. You're not solving problems that are difficult except those

For 90% of SWEs (and closer to 99% of anyone doing front-end web stuff) it really isn't that custom. You're not solving problems that are difficult except those which your team creates for themselves by making bad choices as they service the fairly routine and unexciting feature requests that come in from product. And that's not to say that is a bad thing, all teams make bad choices and have to improve them over time, even when they are using highly opinionated frameworks. It's an unavoidable part of software development, even incredible teams and devs need to refactor. The point of using frameworks is that you can be sure that many of the bad choices the people who wrote it made early on have by now been tidied up. You don't have to worry that Dougie the intern's custom HTTP router is actually all sorts of ballsed when you go to set up your first DELETE endpoint, because Dougie didn't get to touch anything that fundamental to the stack. I do get off the boat when it comes to leftpad and stuff like that, don't ever pull external dependencies for trivial things. But an ORM or a UI framework? Those problems have been solved hundreds of times, absolutely no need for anyone to solve them again unless you're that good that thousands will move to using your solution instead of the existing ones.