So, what I got out of that is.
Designers think Shyvana is hard. (in general)
No one is passionate about Shyvana and thus... back burner.
Quinn and Shyvana are screwed.
I can see the "new person" point as doing something you see as "hard" isn't a good start for them. So the only way Shyvana or Quinn are ever getting reworked likely is if they win a poll getting lucky to be on it and thus forcing Riot to work on it vs them wanting to do it.
But also note that these points only get harder over time, the more skins they get, that is more you need to rework. If their kits age more that's more that you need to solve. So why are you guys slowing down so much? 2 VGUs is a very low number for 2022 (unless you are planning more) Many champions feel awful even if they play okay.
Additionally if Shyvana is screwed over for another year (likely more) then why can't she get at least her kit updated to smooth out her AP/AD/Tank builds?