I have two thoughts about T-grain films I can put in nutshells.
After 10 pages of this thread I'm stunned that nobody has brought up the way that tabular grain films exhaust fixer at the speed of light. When I first tried TMAX films 15 years ago I could fix TWICE the number of Plus-X rolls in the same volume of freshly made fixer. TMAX and Delta films are wonderful, but in my experience they require much fresher fixer to clear completely. When I track the number of times the fixer has been used, my own system counts a single roll of Delta 400 as TWO rolls of FP4+. Once I made that adjustment I never had to suddenly mix fresh fix and re-fix on the fly. This fact alone tells me that something is really different with the substance of the emulsion itself, regardless of the results when printing.
The second thing I consider about tabular grain films is that Delta 100 has such fine grain, I can't always focus on it properly with my enlarger in 6x6 format! I can focus on Delta 100 grain in 35mm format under the enlarger because the enlargement factor is so big. I consciously choose grainier film for medium format because of my difficulties enlarging sharply. That's a failure of my own eyes, but something for people to think about. The result looks just as smooth because it's not enlarged as much. My concession to age.