We aren't drawing enough current to justify the weight of tabs like those. But whatever helps to sell motors I suppose.
The tabs on the current crop of motors still isn't the smallest link in the chain. ...it is the little leads on the FETs in the esc, and the traces on the PCB between the fets and the terminals.
In 17.5 no, we aren't drawing a lot of current-maybe 25a max. A 4.5 mod TC can draw 100a + at peak draw though.
Each FET only has to deal with a small percentage of the total load since there are a number of FETs to share the current. Same with the traces on the board--if you have 8 FET each trace only has to carry maybe 3 amps total if running 17.5.
The 2-3 gram weight penalty of the thicker tabs will at least lower the total resistance if they do nothing else.
I appreciate the fact they they (Trinity) are trying new things and pushing the envelope. There are SO MANY competitive motors at this point that you have to innovate just to be able to stay in the game.