This is my real problem with this (and also broadly pointing the finger to the “Unix philosophy” whenever a project like systemd or Wayland exists, ignoring that the large, complex, multifaceted, and monolithic Linux kernel itself flies in the face of that philosophy). Linux may have originally been built to be Unix-like but has become its own thing that shares a few similarities with Unix.
Ares as a project has a goal of accuracy at any cost, so tends to need a lot more resources than most other emulators. Before the tragic loss of Near, they wrote an absolutely exceptional article about the development of bsnes/higan and how much power it required for cycle-accuracy of SNES hardware, and it’s way more than you would think is feasibly necessary given that emulators like ZSNES (or Gens, as was my Sega emulator of choice at the time) ran under a crappy Celeron in the 90s.
I will say your CPU will likely throttle back well before it’ll shut down due to overheating. It might affect emulation performance some, but your PC shouldn’t shut down or anything.