Yeah, never seen any reason to take them out (other than small power gains, but I've never been a huge power-chaser).
A few friends have removed the power steering from their race cars, with mixed feedback, including some then looking to put it back in (typically via an MR2 electric pump when retro-fitting). I think it's pretty well established that the "feel" and feedback through a manual rack is better, but it's a trade-off with effort/comfort. Especially with the car still being street-legal. I've never had any issue with how it's felt (especially compared to the JDM EP3 I had, which I would describe as a bit numb in comparison).
As for the ABS, again, never had any issue with it. I've had my Honda Jazz on the track for fun before, and from that I can understand why people would typically remove their ABS system ,as it just kicks in way too early and way too strongly; you could easily brake better without it. But the EK9 ABS is so well set up for the track (when used in conjunction with well matched pads), that I've never been in a situation where I've been getting out-braked. And given the always-limited budget, it means not having to worry about flat-spotting tyres with lock-ups.
To some extent, I've gone in a different direction to most racers for now. Typically people strip as much weight out, and as many driver-aids out, for the lightest, purest experience possible. My car is still VERY heavy for it's race class, as I've made little effort to remove excess weight; there's still full glass all round, electric windows and factory side-impact reinforcement in the doors, no cutting of excess metal, etc. I've kept power steering, ABS, factory heaters and demisters, got some fun electronics like wireless tyres pressure/temperature readouts and traction control (although I haven't had time to set it up properly yet). The car is fun and comfortable, and if I ever get to stripping weight it shouldn't be too difficult to get a substantial amount out. But I like it how it is, and I have no delusions of grandeur on the track. I'm kinda more interested in just fiddling with the car these days than actually racing.
Will try to get some interior pics in the next couple of days.