SRAM Omnium crankset

I think there might be some different spacer arrangement for E-Type FDs (and in the olden days of 3-piece cranks and separate inventory for 68 and 73 BBs, there was a special BB to clamp the E-Type FD), but aren't they pretty much obsolete anyway? It's all about Direct Mount now.

Probably. Shimano seem to particularly enjoy busying themselves finding solutions to problems that never existed and reinventing the wheel every other week.