not so much. getting gear serviced just prior to a trip when gear is working makes it more likely to have issues on the trip or live aboard. If folks aren't getting a couple dives on the gear after service before trip I recommend a inspection vs preventive maint/service. If there is any concern, of course address it. Consumer behaviour is such that they do bring the gear in just before the trip, and shops like that, many instructors teach them to do it because it is revenue. If you have a really good shop that does good work.. fair game, that is FAR from universal however.
When living in Cayman, every day a few divers with own gear had issues, without fail they will report "I had it just serviced before the trip and picked them up!" Most common was a slight second stage leak from the tech making the cracking pressure as low as possible and the LP seat taking a set over a couple dives, easy fix and a sign of a poor tech that doesn't really understand how regs work. Followed by a HP seat failure, because they take a set or are a bad batch (which while less common last decade plus, used to really be a problem for many brands, especially with diaphragm regs). Third most common was a couple days diving and the BCD would auto inflate, almost every time they had that silly service tag attached to the corrugated hose and the shop had serviced it using an ultrasound that removed some chrome leaving bare brass that quickly gets sticky. (this does depend on brand of inflator BTW).
I do judge instructors and shops that tell people to get gear serviced immediately before a trip or class as poor quality that put money first