I am very familiar with (and am very competent in) in the Veritas plow and rabbet planes. I have had no issues with their adjustments (you may take more time to switch between the groove and tongue functions, if you don't use them often).
I have not had a chance to use the new Combo Plane, but I do not see the large no. of adjustments as a source of issues in using the plane. Each adjustment is done before the plane is put to use, and each adjustment has its designated purpose. Once the adjustments are set in enough no. of times, they won't be confusing or hard to remember. As far as I see it, the adjustmens are a non-issue.
Simon