I use a combination DE & str8 for all my shaves! BUT - I don't like to use the DE last for clean up or for a 3rd pass. If I'm not extra careful, I'll get razor burn from pushing the DE too much. What I use the DE for is at the very 1st pass, I lightly do my entire chin area. This makes my second and 3rd pass (if I choose to do one), done with the str8, a lot easier on that hard to shave chin.
This practice has worked extremely well for me to get the absolute best shaves I can. Am I cheating?
NO! Hey, it's just me, myself, and I, in front of the mirror every morning. - and I'm all for getting the best shave I can.
It's like "Milton Man" says, "It's the end result we're all looking for"
Regards,
Steve