As a both old Linux and now decade user of MacOS, after I got used to no middle-click paste and no focus-follows-mouse:

1. Keyboard shortcuts are Emacs, Ctrl-A: start of line, E: end of line, K: kill selected or to end of line, Y to paste, etc. https://support.apple.com/en-au/102650#text

2. Karabiner elements (FOSS) fixes keyboard mappings outside of the Settings: https://karabiner-elements.pqrs.org/

3. I have the dock on the left hand side, not bottom and I have a 2 monitor (iMac 5K 27"+ Dell 4K 27") setup with the iMac flat in front of me and the curve/2nd to the right. Menu bar is then close to the main windows.

4. Menu bar widgets etc are fixable with thaw https://github.com/stonerl/Thaw

5. Window management via keyboard is fixable with rectangle https://rectangleapp.com/

6. Use Macports to add all the Linux/Unix utilities, works with MacOS properly (eg Python/Java frameworks). Ports can have variants, plus you can have multiple versions installed side-by-side with `port select`. https://www.macports.org/

Not sure about fonts, on a 5K iMac they're fine and the 4K Dell works too. You need to use a resolution that fits with Mac's ideas of resolution, so I've got the 5K and 4K both at 2560x1440, which is Mac's idea of 2x resolution.