This is probably a double-post but I searched and simply can't find the original. As this video clearly shows, the accelerator pedal is not linear: For me, this makes particularly difficult in long high-speed corners and ovals where precise control of the accelerator is required. It also...
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The 50% is a good indication, but not universally applicable and in GTS 50% throttle position just wasn't 50% in play. In GT7, however, this works very well, but this can also mean that 50% can be too much. See the well-known and "unpopular" M6 on the CE of the Nürburgring Nordschleife. The M6 is very evil because it has a very high torque, probably the highest torque of all Gr3 vehicles, earlier than all other Gr3s I know of.
As I've said many times before, test out what you like best for yourself... if it also allows you to be able to drive as fast as you want/wish, then that's a good thing.
But at least that's my opinion... NEVER be ashamed or afraid to use TCS if you feel it will do you any good..
It always "grounds" me when I look at the daily qualifying sessions or browse through the CE's and see how many of my friends are faster than me. BUT it is sometimes interesting when I consider which times have not already been burned into the tables, even though I used TCS AND automatic transmission.