When 80% of the players would decide to constantly kill you rather than help you, it's not that pointless.
RR? Cars 100% armor? Man i like to help them but not like that, i'm not judging you, you can do whatever you want, but i disagree when high levels give low levels some high level stuff, they don't earn it with hard work and effort like the other ones. They just go through the easy way and when they have everything they are bitching that the game is boring and there's nothing to do.
Giving a low level one car isn't going to spoil them or their experience unless they're some bratty asshole, and if it does, good riddance. It helps develop a sense of community and cohesion. If they hold onto the car, it gives them something to look forward to being able to do to their own cars in the future. If they sell it, it gives them a taste of what its like to have money in the game and gives more reason to work towards earning it. Unless you're going around with glitched money, giving chrome adders to everybody and their grandpapi, I don't see what the big issue is.
You said it, a single car. I'm talking about high levels constantly inviting low levels to RR and in the end of the day the guy has a 10-car garage, level 35, 6 chrome cars given by the high level. My friend and i started at the same time in GTA O, we were in some type of competition to see who level ups faster, and who has the best cars, apartment etc. etc, he started playing survivals because they gave 20k, then he bought an Obey 9F Cabrio wich for both of us was expensive back then. When he realized having money and good cars felt really good, he started glitching, first money glitches, then RP glitches, now he is level 120 and i'm 90, i have mid-end cars, he has all the super cars fully modded, so feeling good about having a good car and having good money doesn't impact on everyone the same way.