Originally Posted by
FBinNY
+1,
Some people see cross chaining as a black and white issue, but realistically it's only slightly worse than the so-called allowable combinations. This isn't black and white at all, just a matter of degree where more is worse and less is better.
It used to be much more of an issue in the days of yore when chains were much less flexible from side to side. Back when exposed derailleurs were a new thing, a lot of British riders developed an obsession for absolutely perfect chainline.