Well I was trying to cut off at the pass the everpresent refrain of "WELL IT WASN'T PERFECT REMEMBER NEEDLEFANG DRAKES? REMEMBER LEVEL 1 DRACOLICHES?!"
Because yes, I have had to fend off those sorts of """responses""" for literal years, and thus have learned to bake in the things which forestall them. 4e's system wasn't perfect. It had a couple of pain points, primarily in the fact that higher level creatures tended to have more, nastier, and more-easily-applied conditions, which wasn't strictly part of the basic math of the game. This meant that there were edge cases where some things punched above or below their weight, especially if the GM was using the dynamic levelling functions of the monster builder, or was inventing creatures via MM3-on-a-business-card and failed to consider conditions inflicted.
More or less, it was an extremely precise science for the science part, but it was also about 15% art, and that part could trip people up if they weren't prepared for addressing it.