Kiara should have been watching T90's "Low ELO legends" videos. Fairly entertaining and he gives some tips while commenting matches between low skilled players.
I also think AoE2 community tries to be more friendly to new people because a lot of them are old farts that see new players making the same mistakes they did back in the day with nostalgia. Also AoE2 has changed and been rebalanced so much since it came out that a backseater could be dead wrong about the info they have. It encourages experimentation somewhat.
Starcraft on the other hand is a game that barely changed after the expansion came out and has been and still is heavily competitively played. It's a "solved" game, with a "correct" (repetitive and unfun) way to play it. So backseaters thrive on it, expecting to always see pro gameplay form even a Vtuber's first RTS stream.
Also, WHERE THE FUCK IS VESPER!