React works because I can hire engineers that can be productive quickly. A lot of tech conversations leave the talent pool aside as if it's easy to find good engineers in all of the options you might have.

The ecosystem is another aspect. You have so many great options for off the shelf components and libraries with React that you might not have with other frameworks.

Before anyone mentions Custom Elements and Web Components, I must say I tried it. Gave it a lot of effort to be a solution but it is not!