Finding fun and unexpected rules interactions is certainly D&D. Finding obviously broken and unintended interactions that make no sense in-universe, purely as intellectual sport, is also D&D.

Seriously expecting the DM to behave like a buggy video game and give you ultimate power because you found an exploitable glitch in the game mechanics is...well, that has also always happened in D&D, but it's hardly praiseworthy or in the spirit of things.