Yes, tell them all to buy Barr or Sorbey chisels. I've been closely scrutinizing chisels for a while now, and find that many of them have neither a perfectly flat back, or the "rocking chair" back, which I prefer. They have a big hump not far behind the cutting edge. My diagnosis is that someone is mistakenly thinking that the rocking chair is bad, and is trying to straighten it cold, and really making a mess of things.

Some people like a flat back, either from preference, or from training. I've got no problem with that, but messing up a classic American style chisel is bordering on sacrilege. Unless you can grind the back, it will never be perfectly flat like the European styles anyway.