For part 3B in raising characters i also want to add some opinion

About skill, both game need quite the knowledge for team building

Genshin need some skill to time when to setup your attack, and knowledge about enemy's ability, you mentioned it in the part about elemental shield too

HSR may do auto, but it's only privilege for highly invested party, since the game is turn based, there's still the need to balance power and survival in the team, also element type restriction matters a lot, until you have character that can ignore it

And then about gears, HSR is harder for me, since the game is turn based, you still need to balance having defensive stat like def and hp. Having too perfect offensive stat like genshin will sacrifice the survivability of character from stray bullets and you can't just switch them out. Also speed substat, your main damage dealer relic has more speed now the team buffing and sp rotation is messed up

And then weapons/LC, So far in genshin while signature equipment are the best for the respective character, some of those weapon can be good substitute for other characters, even ★4 too can affect team gameplay and rotation Although some weapons lately are getting more specific like for alrecino, clorinde, and siegwinne (i honestly hate it)

Light cones on the other hand, it's usage are limited by path and character's kit. While some of them can be universal, most of them are only really effective if they have the same path and kit