If you aren't using it for SSR/SSG then you probably don't need it. If you are writing a really dynamic app with a few thousand users you probably don't need it. It is crazy good for blending dynamic/static pages together, preloading data for page responsiveness and making dependency management less of a nightmare. Things like e-commerce are where it really shines because it can blend thousands of cached SSG product pages with dynamic elements and data in a relatively straightforward way.
I would not recommend it for any project where you are going to have fairly few static pages and relatively few users, it isn't worth the complexity.
Even the devs involved don't have their heads around what they've built, considering responses in github issues.
It's not an environment you can be productive with.
I moved to solid from now on: they don't have as much money but applications built years ago still work today