I started playing Bridge (casually) about 30 years ago and although I recall that I was taught ACOL I don't recall the details but I do recall that it was a strong NT. After a 15 year gap I came back to Bridge about 10 years back and was kindly taken under the wings of a very skilled and long standing player. She told me that ACOL 4 card majors / weak NT was the 'modern' i.e. best system and "those other people" (Neanderthals) playing Cuthbertson, Goren, and Standard American did so because they were too lazy to move on. I now play Benji Acol with a different partner who has played Benzi Acol but with 5CM and a St NT with another partner who is a good player and too young to be a Neanderthal (but of course may have been taught by a Neanderthal. I am now wondering whether we should switch to 5CM and St NT but I can't see the benefits of one over the other? I just did a search on google to try and find out how things evolved but it was a bit of a mine field.