No casting while moving is super common around games, has been common for a long long while. If we could cast and move our spells would also be weaker (since they would balance it towards you not haing to stop casting). It's fun, and nice for a change, but this is not the game that does it! (I think in GW2, a current game, you can do it.. among some others I don't know of).
Garuda's jump is her spell? Why is it wrong for her to be untargattable if she's far up in the air where no one can see her?? She becomes inmune after to keep people from beating on her and getting her lower, they could add more hp to her. Honestly it wouldn't make a difference. Plus it's fun that she does jump, and you have to "be careful" not to eat her feathers in da face.
When your spells get interrupted for no reason and it keeps happening there are 2 things I have notice, one in WP on the satirs where it is a glitch of line of sight and you can't cast. The other one which can happen anywhere is a normal bug where you try to cast something but it keeps getting interrupted, however, if you check the spell that was originally casted will go off and hit the target, causing the dmg and leaving the proper debuff/giving you the AF/UI stack. Very annoying, it's a bug, but the spell still comes off @.@ (I think you can interrupt it by hitting esc, it would be like if you were casting but your cast bar is invisible... pretty odd).
Clipping through floor is again another bug -.-" annoying :/ Mostly visual effect that's caused to some poor floor mapping. Needs to be fixed, maybe it will. (Spell thing needs to be fixed as well).
However, Just wanted to point out the first 2 lines, and then the spell line so you can now know that your spell is weirdly enough being casted regardless.
edit:
To stay on topic, yes you are right, they reserve respect just like everybody else, however they also need to know how to take negative feedback, even if the person giving it doesn't know how to properly do it, atleast work forward taeching them the right ways. And secondly, people get hushed, it happens when threads that have no valid reason to be deleted get deleted, or posts, or people gets banned for speaking their mind against the general direction or specific on some topics.
But yes, try to stay respectful at all times, and keep a clear view, we don't have to be super serious all the time. We can also jest and have fun. Be more flexible, and also try to understand peolpe who can't, and throw a fit/tantrum and rage and curse. -.- While what they do is wrong, it would be wrong of us to hit them with a bat as well just to hush them.