The whole point of the science penalty is to prevent ICS from happening.
Obviously. And the science cost increases do a good job of throttling early-aquisition of spaceship victories, which once again is more relevant for preventing AI puppet empires from running away than doing anything to effect player experience. It's only in Modern and post-Modern techs that the percentage increases become more daunting, because those techs are so much more expensive.
Which again is the whole reason this is being discussed. Wide empires perform better on those expensive techs, and as such catch up and surpass tall empires on science in the long run, but not until after turn 250 or so. They do this
despite the science cost penalty. On the other hand, tall empires played well might still have an advantage thanks to RAs, but wide ones will have the edge in pure turns-until-tech.
The real advantage of
tall play is that you can lock a Culture or Diplomacy victory
before turn 250 (as in have it guaranteed by then, though it might take 40 more turns) by teching to Radio. Before turn 250, Tall empires have the science advantage. They can lock their VC before the AI starts to push back attainable victory times by catching up on culture and CS influence-boosting policies (especially on higher difficulties) , and thereby
completely circumvent a lot of the intended BNW mechanics for late-game play such as World Congress and, you know, war. The tall player doesn't need enough science to get Combustion etc after Radio, because they won with Radio.
Which is really just another example of why science distorts discussion of everything else in the game.
Playing wide generally prevents early VC-lock and leads to a more engaged, interesting late game. It's actually a nice thing, and why I prefer to play wide (though I can only do so by settling on strict schedules to avoid messing up all-important national wonder timing). By focusing on the science, by discussing science at all, all we're really talking about is
Tradition, and the dominance of the
Radio beeline for easy culture victory.
The Radio beeline and general dominance of science need to be addressed but aren't the main problem with wide play.
The deficits BNW has introduced to wide play and liberty that really need to be addressed have to do with money and build flexibility - the flexibility of not being forced to delay hermitage 100 turns if I want to settle in the Renaissance as Spain, for example. Liberty should do more to mitigate the negative effects on economy and culture for
actually playing as wide, and improve how quickly cities settled between turns 100-200 catch up with the rest of the empire, so that expansion doesn't risk completely stalling your empire.