I think it fair to say that all forms of r/c cars and their equipment have developed significantly over your absence and to compete even at mid-order level a high degree of reliability and some basic setup knowledge is required.
Once you get back into whatever class you choose and start chatting to fellow racers your knowledge base will undoubtedly improve along with your driving rehabilitation.
TC's are certainly complex beasts these days and have probably developed the most of all classes from their early incarnations and 4wd buggies maybe pretty much the same.
2wd buggies are taking on all sorts of configuration options to suit the track surface types and the available grip levels, so this is now a fairly complex situation with drivers owning a different chassis to suit each track type!
One class that has stayed pretty constant is 1/12 LMP, yes we have seen the introduction of brushless motors and LiPo batteries but that is true of all electric classes now. GT12 has now blossomed into a very competitive class with lots of ex-buggy and TC drivers getting involved.
So the advice already given is sound, get down to your local club and see what is going on, there is lots of advice to be gleaned very quickly if you collar the right culprits!
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