Thanks, lots of helpful links there. Much appreciated.
Although quickly checking, I suspect they could be over an order of magnitude more expensive than the hobbiest equivalents.
The cheapest of RC servos have a lifetime of a couple hundred hours max, even at less than half of their max torque (if their manufacturers would even specify what is the rated torque). I have one fail after two days of operation with a full rotation every 15 seconds with very light load. There are of course properly built RC servos- with serial communication for feedback, metal gearbox, brushless motor- but those start at ~50EUR-100EUR.
IMO the best bet for hobbyist is NEMA17/14 motor with a driver that has rotary magnetic encoder on them- there are cheap and open source options for that.
Next best thing would probably be a BLDC motor (optionally- geared) with SimpleFOC.