For me, I don't like ovals, I stated that several times. I find them boring to watch even more boring to actually race. Does that mean I haven't done them? I've done them a lot in LFS, because I race F1 cars, and that is usually the only type up and running. A F1 car doing a constant left turn is annoying to me. I did several races on Annabelle server last night where were more fun the the FM oval. Since Annabelle has 20 laps and pit stop. Unlike the 8 lap sprints of FM. I was just so bored after a while, a few races I was starting to fall asleep. For me the fun of racing is not the constant gas pedal down, drafting, it gets old to me. Just slip streaming in a circle is boring. :/ Now sling shotting yourself around to out brake someone in a corner that is fun to me. These are just my opinions nothing else. Never letting go of the gas once isn't fun for me, continously shifting for X amount of lap while trying to do the best time is to me.
That being said, if LFS were to add some Indy or CART cars I would try it, to see what it is like. Would be for fun, but wouldn't be my main interest. As for NASCAR no, I don't like it, for 30 years I don't like it. (I'm 31, so the first year I might have thought about it. lol) It's always been country music on wheels to me, another thing I can't stand. lol Would I try it in LFS? Sure why not, but that type of racing holds no interest for me, so I wouldn't be doing it only out of bordum.
But I also believe LFS should add as many types of racing styles as possible. That includes NASCAR, Indy, CART, etc. Not my type of racing but it is to someone else.