Does anyone else think they're going overboard?

Ummmm... I diasagree with everything you have said.
Raid Han came before palp for a start. Thrawn is considered a fan favourite due to the books that involve him and his key role in rebels. I don't agree that his abilities are overpowered at all, and I don't think he'll change the meta. Within the last 6 months, we've had only R2 and now thrawn as 5* unlocks... but around 20 other characters added, along with multiple reworks.