I know that for the common mortal, having the altitude displayed in full is very entertaining. For those of us who are "in the business" however, and I am sure we are plenty, I'm sure this 4 or 5 digit format is very annoying. Could we at least have the option of selecting what we want in the tabs? Just sayin'.
Beyond display format, this decision was made because we will soon be offering altitudes more granular than hundreds of feet, so the three digit format no longer is sufficient. I think that you will find the 4/5 digit format more useful when you see tens of feet displayed.