After your response about spelling to his quite reasonable answer I think the guy from Dauntless Software gave you at least 1 minute of his time too much. I wouldn't have responded to your comment and would have considered your loss to a lesser product a commercial advantage, you can whine at them.
Software priorities do change usually because customers want different things.
Undoubtedly they will at times have different drivers for updating their software. Sometimes they will be forced to update software in time for legislative change and a software developer must be moved to other more urgent tasks.
Your threat about moving to competitors software without assurances on delivery times would be more realistic if the competitors had guaranteed dates for a Blackberry launch.