I vaguely remember reading when this occurred. It was very recent no? Last few years for sure.

> The Linux kernel began transitioning to EEVDF in version 6.6 (as a new option in 2024), moving away from the earlier Completely Fair Scheduler (CFS) in favor of a version of EEVDF proposed by Peter Zijlstra in 2023 [2-4]. More information regarding CFS can be found in CFS Scheduler.

Ultimately, CPU schedulers are about choosing which attributes to weigh more heavily. See this[0] diagram from Github. EEVDF isn't a straight upgrade on CFS. Nor is LAVD over either.

Just traditionally, Linux schedulers have been rather esoteric to tune and by default they've been optimized for throughput and fairness over everything else. Good for workstations and servers, bad for everyone else.

[0]https://tinyurl.com/mw6uw9vh

Parent's article says

> Starting from version 6.6 of the Linux kernel, [CFS] was replaced by the EEVDF scheduler.[citation needed]