Yes, it's super simple to install GrapheneOS and to revert to the factory OS on Google Pixels. It is done from Chrome browser with phone connected via USB cable, no need to install anything. Of course when you'll switch, you'll lose all data on your phone, basically like factory reset (but esims survive I think).

Contactless payments are often a problem, but adding a card for Uber (directly in the app) should work. I use it frequently, along with Grab, Bolt, Maxim, etc.

It's googles fault that cards can't work in graphene.

Google needs to whitelist graphene basically to work in the wallet app.

On that note, given that graphene is focused around security and privacy, perhaps not givng your payment data to google is probably a good thing

Strange, i'm using Uber regularly with GrapheneOS.

Wallet was one of the reasons I abandoned my well working lineageOS phone on a redmi note 10 as it was a cat and mouse game over month. I feel as long as a vendor does not support an os and Google is so hostile against modifications, it is not a good feeling that they can pull the rug at any time. I was multiple times in the situation when I wanted to pay with the phone and was in the end rejected. I think we need to take NFC wallets and esims away from phone/os vendors again. A seperate NFC enabled vendor independent trusted platform would be IMHO the way to go. Especially with ID wallets and universal bank wallets on the way in Europe. This that they cannot use security as a killer argument to keep us in their walled gardens. I know the solution is cards or a second phone, but affordance counts.

So what is wrong with lineage in this case?