Question

Why did Dr. strange not kill Thanos in end game as he was so efficient that he put dormomu in a time loop trap.
A good and reasonable answer from a diehard fan of mcu is required.
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Answer 1

Answer:

Since Thanos exists inside the time, his memory will be reset, therefore the time loop won't make him tired and fall like it did to Dormammu. Thanos will do what he is supposed to do every time and Dr. Strange will only reset his memory after the end of each loop.

Answer 2

Answer:

becausedr strange that in the end game he could kill Thanos but he put dormomu in a time loop trap