TCS 5 is a huge handicap. Too restrictive, too much bog. TCS 1 is the only level that's truly helpful, and even that is too much for some cars. A good LSD tune can sometimes be more beneficial than TCS.
I've never felt threatened by people using TCS... and most of the fastest players don't use it. Personally... I don't care who uses TCS or ABS (SRF is a different matter), because if I can't beat a guy who's using those, then it's my fault for not being better... not their fault for using them!
Totally disagree. From playing around I can say without a doubt, that TCS 5 does NOT interfere in any appreciable way. If people are finding it does, it makes me wonder about their technique. Lower than that renders it increasingly less effective, which changes the feel and also slows many high end cars down.
I try to estimate values to reflect a car's sophistication level. So a 1990 car with TCS will have a lower setting than a 2007 car with TCS. And a car with "Competition mode" (Corvette), or "Sport mode" (Ferrari) I back it down a bit. So, with modern cars, I guesstimate it around 5. For sports/competition mode, I back it down to 2. For cars that don't have it, I turn it off completely (quite a few cars in my garage as a matter of fact).
ABS is similar. As referenced above, you don't have pedal force feedback, which is all the more reason to need ABS in the game. But either way, many cars have a switch for TCS to be off - not for ABS, you can't turn that off or dial it down. And again, newer systems are more advanced than earlier ones, so on a new car I guesstimate that at 10 as well, and back it down for less sophisticated cars, or off for cars that don't have it at all.
And it makes a HUGE difference. You not only get better braking, it's repeatable, and you don't have to worry about it, just press the pedal and slow down, and spend your focus on the corner and the race.
The other day, I was in an online room with a friend and we were racing Ferraris at Suzuka, then I broke out a Cobra. I forgot to check the settings and was amazed at the feel of the car. It still burned the tires up and kicked the back out, but it was very controllable and I set a good lap time. Then I checked - sure enough, stock settings, TCS 5, ABS 1. So even with TCS 5 it was still letting it break loose in a launch and slide in a turn, and when I turned it all off, I immediately found I couldn't go anywhere near the throttle, and my lap time dropped like 9 seconds. Hardly interferring, I'd say.
Also, with a car that has ASM, I enable that too - again, it's there on the car, it should be there in the game (in particular, thinking about the ZR1 and GTR <- the GTR is built around tech like that). And it makes a big difference (improving lap times with it on).
The more the car/vehicle can do, the more the pilot can keep his head out of the cockpit and off the controls and focus on racing/combat/etc.