IMO it would have been a lot better if Ahsoka had been introduced as the Padawan of one the many background Jedi Masters glimpsed in the prequels and have her story take place during the Clone Wars but removed from Anakin and Obi-Wan, fighting her own battles and occasionally crossing paths with Anakin and Obi-Wan. It would have expanded the Galaxy instead of having everyone knowing everyone.
She was actually meant to be a new Jedi’s master back when Filoni conceived the show as starring all new characters, and being overall much closer to Rebels. Lucas said it should be about Anakin and Obi-Wan, but liked Ahsoka, so they kept her. Filoni thought she should be Obi-Wan’s apprentice, but Lucas said she should be Anakin’s.