It is gamey in that it is unbalanced as hell in comparison with planetary and station wide sensors... that... and the AI never use the tactic which make it a gamey tactic. A HUGE benefit the players don't need against the AI.
Of course, if people don't want to build them it's fine - nobody forces them. But then there might be those who simply want to use all the possibilities a game offers them to their advantage, whether the AI can do it or not. I guess vs. a Human player will we see AIs that lack in one field or the other for quite awhile still...
And how do you define "artificial" limits?
It's an artificial limit to me not to build sensor ships when the game offers the possibility to build them. When I remember past GC II games having sensor ships did never seem the primary factor for me winning a game, much more important was to get a well running space empire up that can deal with any challenge. For example if I allow my opponents to get ahead too much in research or economy sensor ships won't save me.
It is a balance issue... either strengthen planetary and station sensors to be in line with ship borne sensors and have the AI use it to or limit how we can attach sensors or how they scale. It is rather simple really.
Maybe it is, but until it gets changed that way I see no reason to stay away from building what I see as the best option or approach to deal with a certain issue.
You can't be serious when you say that building a sensor ship take away from building a combat ship?
Knowing where the enemy is, his size and capability is THE best defense you ever will get as a human player.
A shipyard building a sensor-only vessel cannot build a combat vessel at the same time. Could be not significant depending on the exact situation, but there might be situations as well when you need to get firepower, not sensors.
And yes, knowledge about the enemy *is* a huge advantage. That's the primary reason to have recon/early warning drones, aircraft and ships these days. Even when there are still smaller countries which don't field anything comparable.