Focus made a very big impact in late game, allowing the skulk and lerk to still be intimidating and allowing fades to stand almost toe to toe with an HMG Heavy. It was also not imba in early game as skulks would have a hard time reaching marines, the usual choice for early game was celerity.
My main concern is that Jetpackers with full armor are very formidable and Exosuits will tear Fades, Skulks and Lerks to shreds. Obviously Frenzy was imba and Swarm was confusing and Focus might not have a place in NS2 mechanics (although it would be nice to see focus in NS2) What attack abilities should we expect to see later?
Or even better, will shells, veils and spurs only have a max of 2 upgrade types? Or 3?