Yes, but there is a difference... the 1 or 2 turns I am talking about here are how many turns were saved AFTER the opertunity costs were already paid. The second part of the analisis is how many turns did paying those cost. In most cases, for the SE, that costs is more than those two turns.
CR as an example, in situations where I need it, tends to save me about 2 or 3 turns on space, but that is pure savings after having already payed the opertunity costs of getting it. CR however has other value... For example, it helps diplo to thte point that it can make or break some diplo attemtps.
The difference is that SE requires you to do two things which competes with a good space date:
1-Tech robotics.
2-Divert production at a time it is going directly into your end date.
In some ways, the discussion of how good or bad the SE is is related to the question of how good or bad robotics is. IF there is no other reason to tech robotics, than the time "wasted" teching it is always more than the turns saved.
So an important question is, is there ever a good reason to tech robotics apart from the SE??
I frankly do not get involved in enough late game war situations to have an clear opinion on that. Others here vehemently argue there is always a better millitary alternative. But to me that is the real open question, because teching robotics FOR the SE, is always going to cost you more turns than you gain...
In the example with a GE to build it, and the internet, then the opertunity costs goes way down... One need to asses now if the opertunity costs to build it was more or less than the 1 or 2 turns is saved. That is the question I want to try and build to. I dont know the answer in this case, which is why I am asking.