I stopped putting foundation in my hives a while ago (see Frames without foundation). Foundation seems unnecessary to the low intervention bee keeper. Its principal benefit is to make extraction and inspection easier. I outlined in the article how shallow frames can be extracted without wired foundation. Inspection is also much the same. You just have to be slower and more gentle.
Foundation is a layer of wax which is placed in a frame. It is printed with hexagonal cell guides. The bees build their comb from it into the spaces between the frames. As far as I know nearly everyone who uses framed hives uses foundation.
We took some honey off our long established Hive (A) over the weekend. It amounted to 12Kg including extracted honey and comb. As always, it tastes fantastic. It's so strong that I can't eat very much.
I use National frames but mostly without foundation. There is evidence that chemicals leach from the wax in foundation and get transported around the hive (NB: I don't have a journal article reference for that claim, so treat with care please). I wanted to avoid that.