A lot of their game logic times based on "game cycles" instead of something proper like counting seconds. ScummVM runs a lot of old Sierra games; it applies some patches to game scripts to fix these issues and also throttles some stuff to make it run at a proper speed on modern hardware.
I played God of War (2018), the Last of Us games, and some other stuff on PS Now (Sony's cloud gaming platform). There were some issues but overall it worked pretty well. There are some games where cloud gaming can't give you low enough input latency, but I disagree that it is as many games as you think.
Are you basing this on Mark Stern's tweets? I read pages 31-32 of the opinion and it mentions Obergefell v Hodges but the decision isn't explicitly criticized.
Because Hyper-V is a type 1 hypervisor, VMs that use it can be faster; I've found using docker in virtualbox is a lot slower than using docker for Windows (which uses Hyper-V).
You have to enable developer mode to run crouton; you don't have to do that to run Linux apps.
Unfortunately I couldn't get crouton to work on a chromebook I bought recently; after switching into a chroot the screen would freeze. I think the issue might be that my chromebook has an AMD APU and an older kernel.