You have to wonder, was the change from 603ft to 607ft worth all this trouble? Looking at the airport diagram, there are lots of altitudes below 600ft, in fact, I see 607 once, 602, the rest is below or even well below.
So we have the "correct" height now, but overall, FS9's height had it closer to reality. If you can even compare FS9's flat airports to the real thing.
Default height, good flatten, forget about those four feet. By raising the airport, you're only going to increase the difference between airport elevation and surrounding terrain. Personally, I think we have enough plateaus and related problems in FS already.
IMHO.