> Because it is much more reassuring having a community back you up in case you get into the edge cases. DIY? Good luck, you are on your own. Not to mention you

> Because it is much more reassuring having a community back you up in case you get into the edge cases. DIY? Good luck, you are on your own. Not to mention you have to scaffold all the things that are already taken of by the framework. And once you're reasonably familiar with a framework it would make sense to use it even for a prototype. Unless you're actually interested in trying out "VanillaJS" or an alternative framework you would just use the tools you already know and get on with the problem you're trying to solve :-)