I wonder how necessary all the pieces of cardboard that have appeared over the last few years would be,if the PPL was still on the ATCO training.Telling us safety this,and remember to do that,and don't do the other.The full PPL teaches most of the commom sense that appears on these pieces of paper.Doing a night rating and IMC only adds to this.
I kept my PPL current for many years after the cadetship,and quite often could translate what I was saying as an ATCO,to how a pilot might understand it.
The basics of flying a Cessna and 747 are the same.In fact some light aircraft of the taildragger variety are just as tricky as jets.I think ATCOs need to appreciate all forms of aviation,and not just the jetliners.Some places still have to talk to everything.