yes well..... assuming what you say is true cliff, the boat has nevertheless sailed, it is too late in the day

and there are so many things xara designer cannot do, and so if you need these things, then you are going to look at it differently; if you don't and all you do is covered by the program, then fair enough

for example xara does not do:

winding rule options
outline position options [outside-midway-inside] - this is often a real time waster
it's animation is basic [and that's being kind]
it's bitmap handling capabilities are tailored !00% towards non-destructive editing, which is actually limiting in many respects
it does not do greyscale colour space
it's cmyk is a pain to use [this may be a bit personal]

mock-ups is what xara does very well indeed [as long as you don't want CAD accuracy] - but in a project there is so much more; the hare does not always win the race