I don't really see how it's BS, you can use fliers too. Also, any creature with the Web ability can block fliers (Giant Spider being the most obvious example). Or you can use some of the eleventy billion anti-aggro cards to deal with them.
It's an effect, just like any. And just like any monster having an effect, it comes at a cost to make it fair. Like Suntail Hawk being "just a 1/1" for 1 mana, Snapping Drake being "just a 3/2" for 4 mana (which would be terribad for a non-flier), etcetera.