They are open to drop some features apparently, but maybe not “90%”

The developers are taking a “less is more” approach. This means that some features of the original sudo may not be reimplemented if they serve only niche, or more recently considered “outdated” practices.

tldr is great, sometimes you can’t remember the exact syntax for a certain command and just need a quick reminder as well.

Can I mod games as freely and as easily as I do on Windows?

It depends a lot on the game, but in my experience not always. Running games straight from steam works really well with a small number of exceptions, but a lot of the sometimes weird tools for patching exe:s and so on that some games use can sometimes be a pain to get running. Not necessarily impossible but yeah this is a reason for why I still keep around my windows installation for dual booting.