And now they drew it at TH. Drawing the line at an entire category (all traits) is just arbitrary, drawing it at the content of those categories (some traits yes, others no) shows they actually put some thought in it.
It's not about THF traits, it's about TH. If TH wasn't a THF ability at all, this would still be a bad idea. Because other people would have to make big sacrifices to obtain it, where BST wouldn't. The traits you mentioned are powerful in terms of combat, TH is powerful in terms of utility, which are entirely seperate categories. TH is not gonna help with any fight, but it's a convenience boost in that you don't have to fight the same mob as many times as without to get your desired drop. It does not compare at all to any other traits you mentioned. It's like having a pet that raises all your skills by 1 point every 5min, just by having it out. Contributes nothing to combat, but gives benefits outside of it that save you time and that other jobs can't obtain natively.