What features will I be missing from the stock rom on GrapheneOS?

Just got my hands on a Pixel 7, my first Pixel after years of using Samsung devices. I'm planning to install GrapheneOS, but I'm curious about features that won't work on it compared to the stock ROM and can't be restored by simply installing apps.

For example, I've read that the GrapheneOS camera isn't as good, but you can usually improve it by installing Google Camera.

What are some key features I might lose that can't be easily regained with app installations?