I no longer work at Firebase / Google, but two points:
1. There may be issues with the GCP integrations & UX/DX, but GCP integration is good for many customers and necessary for the future of the business.
One of the common failure modes for the 2011-2014 crop of Backend-as-a-Service offerings was their inability to technically support large customers. The economics of developer tooling are a super-power-law. So, if you hope to pay your employees you'll need to grow with your biggest customers.
Eventually, as they become TheNextBigThing, your biggest customers end up wanting the bells and whistles that only a Big Cloud Platform provide.
This was a part of the reason we chose to join Google, and why the Firebase team really really really pushed hard to integrate with GCP at a project, billing, and product level (philosophy: Firebase exposed the product from the client, GCP from the server) despite all the organizational/political overhead.
2. I'm excited to see the current crop of app platforms emerge. It has been 10 years since we launched (https://news.ycombinator.com/item?id=3832877) and there are now some great innovations in the space. I like the way Supabase (https://supabase.com/) has exposed Postgres and InstantDB (https://www.instantdb.com) graphdb+realtime is really promising.