Chainline, chainline, chainline....
Chainline obsession was a peculiar affectation in Britain when they used stiff 1/8" wide chains with 3 speed hubs.
With modern, narrow, flexible chains a 1/4" difference in the position of the chainrings isn't as big of an issue as it once was. Consider modern 10 and 11 speed bikes with short rear triangles...
verktyg
Chas.