Dividing posts isn't fun So I'm numbering each subject im addressing. I'm not doing it condescendingly, I only number it so its easier to read and understand What point I'm typing too ^^
1) People only focus on EVA gear when Tanking High-End NMs. Usually ones that your Average TP build won't cap EVA on. They don't really exist except for the new zones. For instance i usually need a Hybrid EVA set when I'm tanking that Cerb-Jerk who drops atheling Mantle (Claws bro, Claws ). So EVA set is obviously something you never want to full-time TP In, Most NMs i can safely Tank in my TP Set up XD, Its just really good to have an EVA set on hand for when you really need it rare as it may be. Also, RR/GH/Apoc rocks!
2) Hide is useless solo on 99% of mobs. It only works on 1 Specific Tracking type (Sight Onry), and does not work on any NMs (inside Abyssea) So While it is useful for a Solo SATA from the front on some mobs, or just SA > Hide > Kill, Its not completely useful on Every mob. In facts its got more mobs that it doesnt work on than it does sadly.
3) Conspirator will always give the message of you receiving the effect (Unless you have a certain NIN or WHM spell up), But if you're tanking, you -do not- receive the benefits. The icon will be there, But you will not get the Bonuses. Imagine it like Sneak Attack. Sure if you use Sneak Attack from the front the Icon will appear, But when you hit the mob it wont work. Conspirator works the same way, The icon is there but the effect does not work if you're tanking. Its not broken .