3rd jobs also get disabled in woe castles, just like baby classes. You should try it sometime and maybe read before jumping to dumb conclusions.
Baby classes are mostly talked about because in some cases the baby classes at quick glance don't look like that they actually are. Sure if you've been playing for quite sometime you can quickly decipher their disguise but to someone who's fairly new to RO and attempt to WoE will not really know that what they're hitting isn't actually this really cute pink fluff of a Crusader but rather a big pink hunky Paladin stud. Same goes for 3rd classes, these do also fall under the same exact category because it does also modify your original class look, why they are also disabled in WoE castles.
what if my WoE class IS A SUPER BABY? would that count as an abuse too?
That's a dumb question, why must you be a smartass?
First of all Super Babies are far from viable in WoE and in you're TRULY determined to for some odd reason to play a Super baby in WoE and SOMEONE out of the blue decides to report you for it (since GM's can't always micromanage WoE to see who's changing looks or not) the GM themselvs can look into the characters name and see that this exact player that has been reported is indeed a cazy sonofabirch Super Baby.
You should feel really freaking special that I actually took the time to explain that to you.