At the end it comes down to what feels right for YOU. If you can drive a light car on softer springs and lighter oil then that's great. That the majority prefer a heavier car is one of those things, I know I prefer my car to be a chubby little porker as it makes it easier to handle and god knows I have enough trouble going around a lap without fighting a wayward car as well
.
Like Tymill says, it's all good, wouldn't do for everyone to be the same would it.