The novax building is a pretty large footprint so requireing t3 power around it does not make it fit into your air grid niceley. I also like the idea of it needing power to fire. Any thoughts on drawing so much power (~ 20K?) for its short beam duration it needs E storage to fire like the eye?.
On it being annoying a large problem is the APM required to use vs APM required to counter - building shields, reclaiming pgens, protecting engineers.
On large maps like sentons it would still be built over t3 arty at higher cost, its just too usefull, but it would give more time to prepare and scout. I agree that part of the problem is the cost and how easy it is to build one pretty fast.
If it is not OP why are they built so often in higher level 1200+ rating ~ 1700 avg rating sentons games? There is almost always one or more built. There is never t3 arty built. It is also common to see two or three from one team.