The water is muddied now with re-releases.
I really wanted to be able to race a rear motor Optima. But I wasn't comfortable doing it with 32dp and no slipper clutch so the re-re is great for me. Is that in the spirit of vintage? I think it depends what you're looking for from a class.
Same for brushless/lipo. I started with brushed in my vintage cars but they are just too much work now (especially in 4wd) and I don't want to be skimming out my vintage brushed motors - so they sit in the cars on the shelves and the ones I run have brushless.
Things have definitely moved on since the first Iconic meetings with more and more people so it's always going to evolve. Personally it's about driving the old cars for me. If I'm at a meeting then yes I will race people with the aim of beating them but it still has to be fun.
Wasn't the TC3 a 1999 release which puts it outside the recongnised vintage of '98 anyway