I liked them, too. Alas, no client ever thinks the same, so far anyway. Overall, I have seen anything quirky with tees get abandoned as much as little used sand bunkers. On free form tees, we would sometimes instruct the steeper slope connectors between two area be mowed as tee. One client was really blunt - "Only an idiot would recommend tee level maintenance on an area that can't be used as teeing space!" I have sort of shied away from them after that...….
Although, I will say that some superintendents like to mow slightly over the edge, especially at the low side, to assure the taller outside cut doesn't slow down drainage.