I think people might be looking at the new changeling designs too literally.  Think for a moment of the possibilities!  Before all changelings were kind of just generic buggy ponies, but now we have a hive with blatant beetle characteristics between Thorax’s horns and the shell covering the wings.  All that the finale has done is shown that changelings can be colorful, compassionate and more heavily influenced by insect characteristics.

Who’s to say that all changelings have to be beetle-y?  Why can’t there be a hive with spider leanings that further develops them?  Or bee?  Or dragonfly? There are tons of possibilities now that don’t detract from the old ones.  Even then, the new designs are different, but they grow on you over time.  At least they did with me.