A final rinse prior to the drying process is probably just as important as the initial rinse. The final rinse will remove any lingering dirt and, of course, soap residue.Agree with Lorne, regarding the pressure washer. Asked about the final rinse before drying. Guess most don't think that is very interesting or considered a key part of the cleaning.
As you mention, the use of a foam cannon tends to necessitate a more targeted final rinse step, with attention given to the various shut lines around the car. To be honest, I have been using a foam cannon and pressure washer for so long now this step is just second nature to me. I also use my blower to drive water (and occasionally soap) from these areas anyway and follow up with a towel and a drying aid.
Is this over complicated or over thought............ probably. Keep in mind though, when I wash my car it's generally as a way to unwind. Adding a step here or there, and therefore adding more time to the task, doesn't bother me as I'm generally having a good time, enjoying some me time........and making my car look awesome in the process.