Where do you come up with such lore? It's not correct.
Straight from Husqvarna: "It is recommended that you grease the bearing in the tip of the bar each time you refuel."
Husqvarna FAQ : Product support - How often should I lubricate the sprocket in the tip of my bar?
The Oregon site contains the same advice. The only exception is Stihl, who went to non-greaseable bearings 10-15 years ago.
I put a lot of miles on my saws, probably more than any non-pro on this forum, and I've always greased my sprocket tips on bars where a grease hole is provided. I've worn out a few bars, and never had a sprocket bearing failure on any bar I've greased. In fact, the
only sprocket nose failure I've ever had was on a non-greaseable bar.
I own both, and I prefer the greaseable style. Some of my saws came with Still Rollomatic ES bars, which are non-greaseable, but I replace them with greaseable sprocket nose bars (Total Tsumura or Carlson) when I have the opportunity or need for a new bar.
By your logic, why would they provide a grease hole, if the bar only ever required grease prior to first use? They'd just pre-grease a sealed bearing and ditch the grease hole (like Stihl did), if that were true.