I would disagree there that there isn't a difference between macro and micro evolution except for timescale.
Just based on the fact that some organisms have more chromosomes then others and we've yet to find a situation where the addition or subtraction of chromosomes have been helpful. (To my knowledge.)
How chromosome levels change is the big question still posed to evolution.
The most prevalent explination is that some mutations like downs syndrom lets people live on... and some others may end up being nuetral rather then harmful. Though unless said mutation proved to be helpful, it's hard to explain why addition or subtraction of chromosones would ever take root in species.
No case of chromosone addition or subtraction has ever been helpful though since it's been uneven.
It's just the definition of Macro and Micro evolution could use some tweaking. To where "new species" doesn't matter so much as "different chromosome count."
