Things from 1.0 era that could return

[Shurrikhan]

You couldn't jump. That's enough for the explanation

...I will never understand MMO communities' fascination with needlessly jumping.

There's a perfectly viable chat function; we don't need to communicate in concussed Portal-speak.

But I suppose the original lack of auto-attack (never mind that you could attack more frequently and choicefully before its implementation) was also a "fatal flaw"...