If I order a steak, even in a rich sauce, I want it char-grilled, in fact during the summer just about every piece of meat I eat is BBQ'd or flame grilled. It just tastes better that way. If a waiter in an English restaurant asked you if you would like your chicken cooked on the char-grill or cubed and boiled I know what 99% of people would go for. It just tastes better flame grilled. Just ask Burger King
I appreciate people will point to the spicy over powering sauces that negate the taste of the tikka but that just isn't true. Plus, the excess tikka marinade ends up mixing with the curry sauce to give it a lift. I find a Madras or Vindaloo too bland now, hot and spicy yes, but still bland. I can only be satisfied by more complex dishes like Chicken Tikka Rezzala or Roshney Chicken (which comes with Tikka as standard).
People always ask what's the point of ordering a Vindaloo as it kills your taste buds, but to me it doesn't. I can still appreciate the taste of a keema rice and onion bhaji. The people who usually ask think they are being brave by ordering a Korma though. To them it probably would destroy all their senses for a week. Once you have built up some immunity to the spicyness it becomes a beautiful addiction.