In no way you say?
What is the point of the Search Engine then? To serve the END USER! Or am I wrong on this? Seems like they are more then related!
Seriously, look at all the changes the SEs are making, and why are they making them? Simple... to get better results for the end user.
If we focus on the end user, then in the long run we are working with the system, rather then against it, as each step we take it seems the SEs are working on putting us two steps behind... why? because we are doing SEO rather then EUO.
Remember when Directories actually worked? What happened to them? SEO did! Now they are not worthy of our time.
Blog commenting? Social Networking? Remember how well those work? Well, they are loosing ground all the time. rel=nofollow for starters..and why? SEO not EUO.
So doing both? Why not... if you are doing EUO, the SEO comes naturally!