... Ugh. 2.4.
Anyone that ever lived the transition from 2.2 to 2.4 knows how amazing it was. (E.g. switching from RedHat Linux 6.x to 7.1-2).
It was the first time I had fully functioning machine, USB, network, GPU (via nVidia's proprietary drivers) - the works.
Coincidentally, RedHat Linux 7.1 marked the last time I had Windows (2000) on my primary machine.
Nostology aside, people who still use 2.4 (mostly embedded systems) don't really need additional features - heck, in many cases they don't even need security patches. (The last I used 2.4 we had an extremely optimized kernel with our own patch-set that was tailored for our machine and was capable of full boot within 4-5 seconds - most likely its still being used...). For these embedded markets, having a maintained kernel is a bonus - nothing else.
DEV: Intel S2600C0, 2xE52658V2, 32GB, 4x2TB, GTX780, F20/x86_64, Dell U2711.
SRV: Intel S5520SC, 2xX5680, 36GB, 4x2TB, GTX550, F20/x86_64, Dell U2412..
BACK: Tyan Tempest i5400XT, 2xE5335, 8GB, 3x1.5TB, 9800GTX, F20/x86-64.
LAP: ASUS N56VJ, i7-3630QM, 16GB, 1TB, 635M, F20/x86_64.