There's a separate post on this, somewhere. I have managed to speak to Fortin, thrice already. EVO-MAZT1 is basically EVO-ALL + the T-harness. Officially they have listed it in their website but not officially released to distributors. That's why it isn't available in Amazon or elsewhere, yet. I asked if I can just buy the T-harness separately and buy EVO-ALL? Yes, possible but the EVO-ALL may not have the firmwire for Mazda. MAZT1, its preloaded. So, can I do away with buying the flash updater? No, you'll still need it to program the keys. Now, that programming is a bit (a little bit) cumbersome.
Anyways, its also now confirmed the T-harness is NOT a catch-all. There's still dicing/slicing involved, but much, much less. Just 3 areas.
Its a great product, but due to lack of retailers carrying it, I am still debating.