[Discussion] How is the absence of drones in TOS accounted for?
The DOT-7 drones appear in the early seasons of DISCO in the mid 23rd century. I know, modern show serving as a prequel to TOS puts things out of whack. However, they are canon.
It is kind of weird how it took until DISCO to add service robots to Star Trek. I'll excuse TOS even though they had the concept of service robots then too, but by TNG, they should have shown them. I'm sure it was a cost-cutting thing.