I'm not sure what to say to this. Honestly, someone has to try really hard to come to an ass-backward conclusion that a blu will go through the trouble of setting TH1 then sacrifice a 7%haste 2%DA gear piece for a +1th piece and still maintain the same or better kill/proc speed of a bst+pet with TH1.
This has nothing to do with Blu getting a better TH than Bst, cause it is the same damn thing as bst only there is a TH+1 equipable item that quite possibly no one will ever put on over a better piece. That is like saying a thf/dnc will sacrifice their kill speed by equiping Thief's knife when farming Dynamis (which if you do...shoot yourself in the foot...seriously, I'm not kidding here...get a gun and shoot yourself in the foot).
Now, if blu/dnc could set TH1, super tank 2-5 mobs, proc, and have moderate kill speed you might have a case. Fact is, they can't without support or sacrificing something else in the process, just doesn't work that way. I have thaumas, I have quite a varied option of haste sets to choose from, and I can tell you right now I would never ever sacrifice belt slot to put on TH+1 item and sacrifice a useful job trait lvl to set TH to reach TH2. It just isn't worth the overall sacrifices to attain TH2, let alone just use the item for TH1 effect flat out.
By the way, please find me a blu that will go through the trouble to setting TH1 and wear an augmented sash to farm thinking it is far more beneficial to do so than alternative means. If you find this person, I would like to /point and /laugh until I'm blue in the face......for I find the thought of someone doing this absolutely hilarious.