It's probably leftover engineers from Losi that are still there from before the Horizon takeover that are still designing the Mini B to use quality parts. Not junk Spektrum chit 😆
Servos have different tooth counts. This is one thing that makes servo and horn shopping difficult. Spektrum stuff is usually 20T for their smaller stuff, and 23T for their bigger servos. Savox uses 21T for their micros. There is no standard unfortunately.
I find it funny that you took it to a...