Agreed to certain situations (also depending on your driving style and how much experience you have as a racer), as I do think that logic does also play quite an important part to setting a car up well.
99% of the time, you don't need to understand how to set a car up to make you race consistantly, (even with a bad tyre choice you can still lap consistantly, albeit with very slow laps)...
But you DO need to know how to understand how to check if something is broken.
However, that will only take you so far.
Understanding the physics of why a car is offloading its rear wheel on cornering, or why droop is so important at making the car handle etc etc can sometimes be explained better by someone who has been racing for a long time, or has a lot of experience in that area.
I have seen a kid going down the back straight and getting frustrated because their steering wasn't centred, and they had no idea how to fix it as they had only just started out racing.
5 minutes later and an adjusted servo horn, and I had that fixed, all good and he went away happy.
You have to remember that r/c attracts a wide range of people, young, old, male, female, newbie to a world champion. With that comes a wide range of knowledge and experience, which can be shared, or kept secret.
If you can keep your car in good condition, and you can race it consistantly, you are half way there.
If you can also set it up well and find the best combination of equipment for your needs, you are on to a winner
Sounds so simple... But you'll never stop learning (and sometimes it will make you quicker), so never think about doing it
I don't think it does any harm to listen to anyone taking the time to speak to you, unless you have a firm reason why you shouldn't be wasting your time with them...
What's the worst that can happen? We make our own decisions as to how we race.... We reap the rewards or "oh damn I messed up" from the end result.
For me, part of racing is the social side to it (and to escape the wife and son for a while
Opinions are like a..holes, everyone has one so that old saying goes!