1) I know I won't be buying anything but LC+ 2.0 if I want that control system.
2) I'm not entirely sure what you mean by LCx. If you mean LionChief, many are semi-scale, but they do have some scale sized locomotives, mostly smaller engines like the Camelback or A5. None of them are considered "post-war" which refers to products produced by Lionel in the 1945-1969 timeframe, long before LionChief.
3) Asking here is not a bad idea.
4) TMCC locomotives run in conventional mode with just a transformer.
5) The only manufacturer that makes LC/LC+/LC+ 2.0 trains is Lionel, no other maker is licensed to use that technology.