As you just told us the issue was a bad barrel, I would ask what that experience has to do with whether or not a BOSS works. Does a bad (whatever that means) barrel mean the trigger is garbage, or the stock is useless? Does it say anything about a BOSS? No it doesn't say anything about any part other than the barrel.
I do not think a BOSS is something I would want on my "dream" rifle. Then again, if I ever buy it, that rifle is apt to cost upwards of $5,000. For that price the rifle had better not need tuning.
The question was posed to us, "The "BOSS" why not more use?". To that we should give rational answers:
1) Browning/Winchester haven't licensed it to anyone else.
2) Some gun buyers are religious about what they believe a rifle should be & these people didn't see a BOSS on granddaddy's '06.
3) A BOSS only works if someone takes the time to tune their rifle with it. This may take 25-30 shells, or possibly more.
4) Most hunters can easily get by with a rifle that shoots 2-3 minutes of angle (MOA) since they never shoot deer outside 150 yards. That 2-3 MOA is a huge improvement over the 5+ MOA their old lever action 30-30 was known for.
5) Many gun buyers do not have the luxury of trying many different firearms before they buy. If gun buyers tried before they bought more would opt for guns that shoot well out of the box, Savage, Browning/Winchesters w/ BOSS, Tikka, etc. would quickly displace Remington atop sales charts.
6) The BOSS with muzzle brake
is LOUD. Even though Browning gave away BOSS sleeves without holes for hunting & these are available for Winchesters (at Midwest Gun Works), many BOSS owners still hunt with guns that can deafen them and anyone near them.
The argument for the BOSS is simple, "They work!". They work by tuning barrel harmonics to whatever load is being used & they work by reducing felt-recoil & muzzle jump which makes practicing more comfortable — and effective.