Pixel 6 is supported through community ports (6, 6 pro, 6a), but unfortunately it is not supported (yet?) by the online installer tool. So it's for people who are a bit more willing to get their hands dirty.

the launcher might become a very similar but stripped down version.

if you liked to have more features, try the lawnchair launcher from f-droid. its a fork with readded features. you need to have the izzydroid repo activated to find it

https://apt.izzysoft.de/packages/app.lawnchair

As long as it's based on software rather than hardware I think it's safe to assume it will be lost.

You can reinstall some things (such as the default camera app) from apks you find online, and apps such as Google Maps can be downloaded from the app store (which contains all apps from the play store). But by default it strips away everything that is installed on the phone by default and replaces it with a degoogled ecosystem, and I don't think it differentiates between different devices.