ABS are safety precautions, which are necessarily, but for some people who's style of driving aren't include something interfering with your braking than ABS is something optional, of course we're talking bout someone with enough skill to replace the ABS system, and trust me its not something easy to do...easy to say though....(for instance, Tsuchiya races touge with a NSX WITHOUT ABS and self done ABS on his own when his NSX understeer...., but corrections are welcome, its a Hot Version vid, just the previous or previous previous issue, doesn't know whether its the NSX own ABS or is it the dori-dori's own footwork..)
For power-steering, for me.....i personally(on my driving experience), power-steering totally blocked me from feeling how's my whole front of the car(an FF car), i can nvr know the weigh stress on the front wheel and therefore, resulted in over-radius cornering/oversteering=sorta Drifted if you know what i mean.....and in case your wondering bout how hard to parking without PS? simple, get a pair of lighter rims and you'll feel the difference instantly...(happens to me hehe) and get your tire pressure to b inflated perfectly, some times ppl tends to deflate their tires a little bit when on track days or 'you-noe-what-session' in order to improve grip, but seriously if your not racing, leave your tire perfectly inflate, it helps alot on non-PS cars plus doesn't dig away much of your tire....so for me, i'll keep the ABS(as i hasn't gone to the PRO level yet) and strip the PS(cuz i hate them for reasons above..)....summore stripping the PS you'll be decreasing your chance of something broken...which is a good thing, one way or another...