Well, simply because you don't know the factors underlying their design decisions, that doesn't make them dumb. Just maybe they have reasons that make sense to them if not to you; the market place will be the judge of all that; there is real competition now :-)
I guess it depends on the definition of dumb. I cannot imagine that I am alone in thinking the restriction on printing on cut roll paper or even 17x25 paper is a tremendous drawback.
Unless this printer is virtually uncloggable (and doesn't blow through print heads), or has some hidden attribute that no one has mentioned in a review, then its doomed to failure in the market place.
If a company allows design considerations to overshadow critical features offered by their competitors - that dooms them to failure. Design should be tailored to what customers want and expect.
Not the other way round. If epsons last few A2 printers were incapable of doing larger than 17x22 maybe it would be (somewhat) understandable for canon to omit this capability. But thats not the case.
Maybe I am missing something. Is there some feature that justifies the price gap that hasn't been mentioned in the reviews appearing to date?