The rationalization of the Novax is to barrage shields to prevent them from refreshing / recharging.
Another point of it is to raid enemy structures on the outskirts of maps or structures that the enemy didn't bother to shield 25 minutes into a game.
To counter a Novax, a player just needs to spend about 600 mass on building T2 shields. Yes, that adds up, especially multiple shields and multiple players, but... by building 10, 20, or even 30, T2 shields to protect what's decently important means you've spent 6, 12, or 18 thousand mass and they spent 36 thousand mass. Either way, you're saving mass.
If they build a 2nd Novax... well, they should've built an Arty instead, honestly.
Once the Novax is countered, it's practically useless aside from tickling away at a shield - its Omni, radar, and vision radius is pitiful, especially for a satellite that supposedly orbits the map.
It's an experimental... If the damage is reduced; well... they may as well move the unit into the T3 stage.
A Nuke is far cheaper and far more deadly because it causes the enemy team to invest in SMDs to protect their bases. SMDs are far more expensive than a T2 shield (Obviously) - hence why the nukes are being nerfed.
A Novax does not need a nerf in my opinion as its cost, performance, and abilities are already at a disadvantage.
Again, its strength of it comes from being able to raid unshielded structures - which can be countered by proper scouting when the structure is being built.
~ Stryker