I have been thinking of this exact question lately and have to say yes, absolutely.. the SR is teaching me all about pressure and touch and you learn quick cos one mistake will cost you
so i reckon having a blade without guard rails helps you align the correct angle of the DE for an even better shave with the DE, add an awesome razor like the BB or WR2 and you get quite superior shaves with a DE than a SR, although that last comment could be due to my low SR skill levels