No less than Alan Cathcart had a ride on the T-Bird and reported the engine was very nice indeed with gobs of grunt.
He is one of the very few writers who is qualified to run a suberbike at speed and is known for being objective in his reports.
I'm in the camp that says Triumph got the engine very close to perfect for this type of motorcycle-but time will tell.
As for what they did or did not due, those of you who manufacture anything or engineer anything know that EVERY machine is a compromise-that's why they make different models. It's a cruiser-riders that like cruisers now have a different choice than the V-Twins and the market will decide soon enough.