The biggest benefit of Firebase that isn't easily replaced with something else is authentication. Sure, you have Auth0 and other auth providers, but Auth0 is super expensive. The database is easy to replace, even MongoDB is a nice easy option if you want something like Firestore.
Every time I go to switch, I go down the problematic rabbit hole of implementing auth and remember just how painful OAuth authentication truly is. The most promising option appears to be Supabase, which is eventually going to support every Firebase feature that you can host yourself.
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The biggest benefit of Firebase that isn't easily replaced with something else is authentication. Sure, you have Auth0 and other auth providers, but Auth0 is super expensive. The database is easy to replace, even MongoDB is a nice easy option if you want something like Firestore.
Every time I go to switch, I go down the problematic rabbit hole of implementing auth and remember just how painful OAuth authentication truly is. The most promising option appears to be Supabase, which is eventually going to support every Firebase feature that you can host yourself.