Do you know for a fact that any guild ability or spell that doesn't provide combat aid isn't factored in Tax? Cause I'm pretty sure that's not 100% true, could be wrong but I'm putting my money on no. And even if it doesn't provide direct aid while in combat, much like Goldbezie pointed out it can give you the drop on someone, which can be more useful then another damage spell.
I do recall extensive drama over last nerf of BDA, in which it was mentioned (although I didn't find a confirmation) that move behind doesn't cost caid.
And sure, apply it to Thieves all you want. With Sup Guru Sneak/Hide it doesn't matter what your base awareness is. You'll never find them without grabbing specialized gear to improve awareness. You're comparing something that is based on a % to see with something that is either you see it or you don't. So again, if you want to find someone Invis or Hidden. You need specialized gear, which is available out there.
You're involving another OCC guild here though, just as you can get 100 sneak, anyone else can get 100 awareness as well. If you're still invisible to someone with 100 awareness with 100 sneak then it's idiotic and needs to be fixed.
I mean this is like me pointing out that Minotaurs can hook people and toss them and there is absolutely nothing that can be done about it since it's an emote. Should that get removed?
Everything has consequence, I can do it to you and I can do it to Morrison, the results will be quite different, so I would say there's a counter to it in form of "kill" command. When you're invis however, consequences are what exactly? Right, none.
Rangers can drop brawl, there is no counter unless you're a club user. Should that get removed?
Let us try an expert try to droprbrawl me and see how it goes, so there's a counter in form of a stat.
There is no counter for everyone to block dragonfear, should that get removed?
Wrong again, I'm yet to see someone who is not a knight to resist it completely, but the paralysis part is quite resistible, and once again it's all about stats, not sure which stat exactly, but bigger people do not tend to be paralyzed by dfear, while smaller do. I'm all for giving people with high DIS complete immunity.
There is no counter for when a Grunt throws shit at you, should that get removed?
I can't stop custard pies from being thrown at me, should that get removed?
It's amazing how many things "kill" command counters, right?
Can't counter armour breaking abilities, we should remove those as well.
Sure can. Spells can be resisted, normal abilities need to land first to break something, weapons like maul need to hit, so DEX, cover, block, stagger, dodge, special blockers, etc.
I say we make one giant list of all the shit in game that doesn't have a counter. Emotes, NPC Specials, Guild Specials, Items. Then we can all sit down together and come up with even more items to counter every single one of them.
You're kinda missing the main point here, once in invis all that has no consequence, hence no "counter". Once in plain sight all those have an easy "counter" in form of consequence to your actions. So as there's resist to spells, or ways to see hidden people, there should be a similar way of seeing invis people, and I don't mean killing a huge ass NPC with 0.0001% drop of an item you then need to wear to be able to see invis, and don't even get me started on why minos can't wear MASKS. So it can be a skill or spell/ability that does that, implementation details don't really matter. Maybe not as simple as eating a herb, but definitely not as hard as killing Vermi 1000 times.