Popularity for frameworks is also important if the framework needs adapters to enable third-party libraries to work with the framework. Depending on how opinionated the framework is, the friction in embedding libraries may hamper productivity indirectly.
If you're a one man band, then it's definitely less important. If the framework is a really good fit for the job, likewise. Otherwise, there's safety in numbers.
If you want to grow a team, you need to hire a mix of experience levels. With younger devs, talent is correlated with being opinionated - they have passion that hasn't been balanced by broad experience. And opinions are fashion-led. Find me a young dev who has no real opinions, and I'll show you a dev who has no taste.