facing at the LBS is a big waste of money IMO. i would much rather trust the manufacturer of the frame or BB shell to have faced it properly during the manufacturing process. (there was a time, many decades ago, when quality frames were only made by hand, and depending on the builder, tubes may have been cut out of square more often than today.)

for me to take the time and trouble and expense to present the frame to the mech at the LBS, i would first have to be convinced by someone that the BB was indeed OUT of square. my guess is that the LBS can't or wouldn't do that. and if they did manage to show me that the BB was out of square they would then have to show me that it had been fixed.

way, way too much trouble. and i wouldn't be surprised that even finding an LBS that would do it properly is unlikely.

but it's fashionable for BB facing and headtube facing to be recommended these days, so i guess some will recommend it no matter what...