It’s certainly not worth arguing aboutI do my own setups as well (and have done them for plenty of other folks for 20+ years) and figure it takes me an extra 5-10 minutes after I change strings (at most) to go over intonation and string height check with feeler gauges to double check everything. It's just part of the deal for me, and it's how I was taught to do it by the luthier who showed me the ropes a long time ago. The adjustments are rarely major, but I have been surprised at the intonation changes I've had to make going from brand to brand - ESPECIALLY if you're going to/from a tapered core design and how it contacts the bridge. The truss rod shouldn't need tweaking if everything is staying the same and the neck is already known to be stable, but I always check that as well after the strings are on for an hour or so.
If you're paying someone to change your strings, I would hope that 'tech' would also double-check those things as well. It's kind of like a mechanic who looks over everything else while the hood is up just as a general rule, and if there's something that needs addressing.... the hood is already up ya know?
That’s for sure
