Something else to consider is that Kodak were not terribly keen on gas burst deep tanks without significant additional manual agitation for either E-6 or C-41 - gas and manual agitation for C-41, gas was actively advised against for any roll format for E-6 - rack and tank dip/dunk are fine because they mechanically agitate and gas burst. While the non-uniformity might be less with BW, you might want to consider that the critical development stages in both processes are not that different from BW film. What worked OK for large batch, high throughput BW sheet film processing (with relatively low image quality standards demanded, owing to lack of enlargement/ purposes other than fine-art photographic quality) in the 1940s/50s with relatively much lower technology BW emulsions, may not work as well with more complex, modern structures. Development uniformity was well studied by Kodak etc - hence why they don't recommend stand processing either.