I absolutely agree and had the same experience with my ''stage 2'' 2019 Road Glide.
The selling dealership was happy to fit parts I wanted and the DJ PowerVision, but used a canned map. And I am certain the map they would have used would not absolutely have matched the fairly unusual intake/exhaust set-up on my bike.
The warranty-servicing dealership (far closer to me, the sellers were the only dealers who guaranteed to get me the bike I wanted in the colour I wanted) said after the first service: ''This bike is running nowhere near how it should with the Torque cam and S&S intake/exhaust. Highly recommend you book it in for a couple of hours on our Dynojet rolling road. Our head mechanic has had extensive DJ PV training...''
I invested a couple of hundred quid .... and the ''before'' and ''after'' rolling road printout results were night and day.
It would almost have been embarrassing for me that I had not noticed I was riding a slug, but I was coming straight off a Shovelhead to this Milwaukee 8, so I thought my new bike ran OK for the first 1000 miles ha ha ha.
PS: the selling dealership also reinstalled the stock shitty-quality lifters when fitting the H-D torque cam pre-delivery. A huge no-no, the servicing dealership told me after tearing into the cam case to replaced the grenading lifters and damaged cam after 11,000 miles. Yes, full warranty fix for free despite many non-stock parts.
Some dealers are certainly better than others.
Bike is now at 36,000 miles and runs like a champ.