Having a custom UI is fine i think. i would like to see Aion allow this feature to suit you personal needs.

Other addons like dps/threat meters shouldn't be allowed, and NCsoft have stated they wont allow them. The player should play the character not the other way around like a certain other game....

I hope they follow a limited cautious approach to add-ons. The sheer number of add-ons for Wo_ (censored) was bewildering, as were meta-addons like titan, and clients like wo_matrix (censored). They were well thought out and useful, but I never got over feeling like a newb if somehow I didn't have the latest addon that everyone else in the group or guild had. And the screen....only gane I've heard people complain about a crowded screen.

lol @ crowded screens...I think in WoW maybee a third of my screen didnt have some kind of gadget, button, or information cluttering it up XD but I didn't mind playing like that.

To the OP thankfully NO! NO addons! WOOHOO yay.. which I must say I am happy about. . I can honestly say I have never used an add on.. I was tempted once with a map marker add on back when I played WOW that was before Vanguard came out. But never ended up installing it.

I have actually turned down guild invites when I have found that they required certain add ons.  I consider myself in most the games I have played to be fairly competent without them... I never felt I needed them to play the game effectively.

I'm all for no addons as long as Aion don't make it so addons are needed. Take the Patchwerk boss from naxx 25 as an example of needing an addon

* Hateful Strike:

Patchwerk will use this ability at a 1 second frequency on the target in melee range with the highest HP who is also one of the top three on Patchwerk's aggro list. Cannot be used on the main tank unless there are no other targets. This means that if you have 3 tanks, the rest of the melee is perfectly safe as long as they stay below the threat of all 3 tanks and none of the tanks die. Does 79,000 to 81,000 raw physical damage which can mitigated by armour and parried/dodged. This is about 23,000 damage on a partially Naxxramas geared tank. This ability will add threat to the three most threatening on Patchwerk's aggro list.

Here is where omen comes in very handy.

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Originally posted by FastTx

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Originally posted by Xasapis

That's also remains to be seen. Lineage 2 didn't allow users to customise their interface but the botting was rampant.
Fortunately or unfortunately, botting and hacking prevention is both a passive and active endeavour for an MMO company. Passive measures just aren't enough.

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I'd like to chalk the botting up to the fact that Lineage 2 server files were stolen... TWICE. How hard is it to make a bot when you know exactly how the server ticks?

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AION already got plenty of bots and hacks, nothing was leaked. Your point?