http://www.polyomino.org.uk/british-time/
Besides, we have large windows.
(1) I want my cats to be fed just before I go to sleep so the cats have the maximal period of full belly when I go to bed. I go to bed at 11:00 pm. Keep in mind that I observe DST changes for myself. But if I never adjust the feeder for standard/daylight time, then either the cats will be hungry until the midnight feeding or they'll be fed an hour early at 10:00 pm. In either case, they are more likely to wake me up for food during the night.
(2) The cat feeder is in my bedroom and since I have it set to feed the cats just before bedtime, I don't want it making noise an hour after I fall asleep. That's what would happen when I've switched to daylight time but the feeder hasn't.
The point is that there can be legitimate reasons why you'd care about a DST adjustment even if your cats don't.
Arbitrary change or not, at 4 am cat on face always wins
Not really related to the point, but should you be adjusting the time for daylight savings at all? I mean, the cats don't care about the arbitrary 24 hours we humans use to divide up the day, so wouldn't adjusting the time for daylight saving just seem like an arbitrary change for no good reason to a cat?