A few random thoughts from some one who worked as a technician in a Honda dealership from 1979 to 1988.
1st. I know this was 30 years ago but I believe the dealership business model remains the same. Technicians are on the bottom of the pecking order in the dealership. A quick Google search showed that the average motorcycle tech pay is $14.50 a flat rate hour compared to an average $100.00 an hour labor rate. This is about the same pay I was making in 1988 when the labor rate was $35.00 per hour. This being said, a skilled technician will not remain in a motorcycle dealership for very long. I personally went from a Honda motorcycle shop to an Acura dealer when they 1st opened for twice the pay and half the hours worked in a week.
2nd. The person working on your beloved VFR has probably never sat on one much less tried to perform any maintenance on one. Exceptions being shops that are centered on racing or performance tuning will have people on staff that are experienced and have a passion for what they do and are payed accordingly.
3rd. The question of the OP. From my personal experience from adjusting valves on thousands of bikes from 600 mile 1st. services to routine maintenance, very rarely would an adjustment be needed and when needed was not more than a .05 mm. adjustment on a shim over or under bucket adjustment which would not cause any adverse effects reliability or performance.
4th. I bought my '97 VFR with 20k on the clocks in 2012 I went through the bike changed the fluids, plugs and found a valve cover oil leak. When replacing the valve cover gaskets I checked the valve clearances while I was in there. No valves were out of specification. At 45k I had an acceleration issued and rechecked the valve clearance and they were still within specification turned out to be a carburetor issue.
5th. Knowing what I know I would not take my motorcycle to a dealership for any reason other than recall issues and even then when receiving the bike back would go over it with a fine tooth comb before riding it.
6th. Bottom line! Unless you can do the work yourself or have somebody you know and trust to work on it for you, Just ride it till the wheels fall off which will be a lot longer than the average person will keep and ride any motorcycle and save the money from that valve adjustment for new tires and chain and sprockets.