So, in the end, it sounds that is better to use Secureblue as it is since it seems to support quite a lot of the things that Bazzite does. Am I following this right?

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Any particular friction with GPUs? I see that they have a Nvidia image and they actually recommend if possible to stay away from Nvidia but does it work well with Nvidia or AMD GPUs?

Can we maybe tinker it to get some of the things that we have in Bazzite?