It's not as much an "overhead" as it will mess up your latency. Limits don't stop you from using available resources until you hit the relative allowance in a CFS window, so a 1 CPU limit on a 32 CPU machine at worst gives you 32 cores for 3.3ms every 100ms.

Could it be that they're using coding agents to develop applications they previously wouldn't spent time on developing? Like internal tools, or experimental builds.