Automata Theory
The study boasting fidelity to input while proudly ignoring the messy reality by imagining machines with infinite states. With just pen and paper, one can become a caretaker of Turing's deities. It sketches idealized contraptions divorced from any practical computation, and theorists remain forever trapped in their own spirals. Unresolved problems serve as bar chat amusements, and under the guise of applications they sink deeper into the abyss of abstraction. Efficiency? That is someone else's concern; theirs is pure intellectual curiosity.