Again, personally I work alone it seems to work best for me

Even trying to work with a webdeveloper is a pain sometimes
Interesting I have never had a problem with developers or designers.
I think it is important to explain to business owners just how crucial SEO is to an online business with hopefully examples of previous work demonstrating the dramatic increase in business that is possible.
It is then up to the owner to instruct the developers to give the SEO every assistance to achieve the goals.
My own experience over many years is that once a designer understands the importance of what we are after achieving they work in complete harmony with us.
Now I think there is a need for mutual respect in the relationship.
I certainly respect that the developers have far more skill than I do in there area's.
As said its important to get the site owner to instruct the designers/developers to do what is asked by the SEO,Not in order for me to say I am the big I am or throw my weight around.
But in order to gain the success of the site.
I am currently working with a site that has 3 developers and various other people involved and we all work in harmony for the greater good.
They always defer to me before any changes are made to the site ,simply because they are not qualified to assess the impact of changes on the sites rankings.
Having said that if a developer does not toe the line then they are out or I am.
P.S so far I have never been out.
Earl