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I don't think that you will always need to get the orb just for the fact you may have enough slows or stuns to keep the target down long enough to kill them. But if you are not getting it because you are unable to get into the fight and harass then you are probable in a situation where Omni was the wrong pick. Getting into melee range and being able to tank and slow better than the rest is really the only reason that you might need to pick him up instead of dazzle or sd.
Mek + Arcanes is more tanky than Vang + Treads.
True that the mek would give you another nice heal and armor, you really don't want both the mek and the pipe on the same hero for reasons stated in the guide. The vang is worth more in a situation where you are the one that is initiated on as many times the other team can keep you chain stunned long enough to keep you from meking. As far as the arcane go, to each their own. Most boots can work on him so it is a matter of play style.