In commenting on your 2nd point, an Architect familiar with development vs an Architect that does other types of work each have different skill sets @Robert Frazier.
Having worked in corporate architecture firm for 13 yrs before opening my own firm, I understand your basis @Jay Hinrichs and it's totally accurate. Some are more cumbersome than others with project schedules but that comes down to project types and size of firm. I respect your many years of experience Jay but want to bring some perspective from the other side of the table.
In a corporate office which is running 10, 20 or even 50 projects at once (depending on the firm size), what is the benefit for the Architect to drop their other projects to jump on yours quicker? Have you paid their standard fee (or beat them up to lessen it further) or a premium to cut the line when updates or revisions are needed? Most have not done the latter. Therefore Bill & Jane's vacation house in the Hamptoms or the ABC Company tenant 10,000 SF commercial build out is ahead of your development.
Robert- If you do have the correct Architect for your project, then the problem is: they aren't incentivized to change anything. Especially if you haven't went into detail about how you want things to occur and what the project schedule is. The turnaround time should be in your agreement so they have priced things accordingly to achieve what it is you need. If it is not spelled out in the agreement, then they're abiding by the stipulated scope and your gripe may be with an unknown expectation or one which was not ironed out from the start. Nowadays and for most firms, no one client has paid to have 100% of your undivided attention for their project.