I guess "rough" is a relative value.
I have seen some "rough" bbls, and even some that have shot well anyway. But I can also say that I have seen lots more bbls that were poorly made that didn't shoot worth a darn.
"Rough" might be an indicator for the attention to detail in the bbl manufacture. If it was the chamber, it also means something about the smith who reamed the bbl. Thankfully I have never been handed an ugly one when spending my own money, other than the factory hammer forged bbls that came on some rifles I bought off the shelf.
Cosmetic indicators for workmanship are still no guarantee that a bbl will shoot, but they point to lots of things that went right rather than wrong. Clean steel, clean coolant, tool sharpening and wear, set up, etc, all have to be done right to avoid what we are discussing.
Yet, there may or may not be any correlation to performance based on cosmetics. It does take some serious defects to say for sure a bbl is scrap, but I would never want to be in that debate for my own money. Cosmetic workmanship is a good indicator of what to expect. Stringers, comets, pull-outs, inclusions, pits, etc., are not a good thing to see in bbl steel, nor is tool chatter, roughness, profile, galling, etc.. These are indicators and warnings.
Without a doubt, Nick's progress with his speed stats means his loading process is improving. It is an indicator that a number of things he is doing are on track and under control. Based on that, there is nothing that stops him from tuning any way he wants.
We all (many of us) know that short range BR and even some 1000 yard work has shown that sometimes the tightest groups do not come at the speeds that give a tight ES. Many BR records were made by folks who never timed their loads at all. That said....
The point isn't about electronics tolerances, bbl finishes, chronographs or speed stats, it is about the indicators that Nick's reloading process is tight and under control. If he were interested in unknown distance shooting or ELR shooting, speed stats would be a different priority. He has been able to master many things to get to that result and with those processes under control he can tune his load were he wants it to be. For him, it represents a type of personal best and we should be happy for him.