I think you made the distinction already -- if you're just looking to learn, sure, spin your own thing -- it's fun and you'll gain some perspective on why exist

I think you made the distinction already -- if you're just looking to learn, sure, spin your own thing -- it's fun and you'll gain some perspective on why existing frameworks probably work the way they do... On the other hand, if you're building something for your job, for a production deployment -- you should probably pick something that's established with ample vetting in other production environments, documentation you can leverage, and a community of users you can turn to if you need help.