If anything I'd want Culture to be bigger than Science in gaining affinity - Science is already quite powerful in BE.
Maybe [science + {culture x 2}]/2 = affinity, then. Hell, we could even make a super crazy formula that takes health and growth into consideration, to increase the importance of these aspects.
My point is that right now, science = affinity IF you research a tech that gives it. Thus, affinities can come as faster as you beeline them [and thus lacking lots of useful things for too long], or as slower as you postpone them [while getting nice stuff earlier]. I don't like to be forced into choosing between affinity and biowells, for example.
Also, depending only on science for affinities [as it is right now] gives too much importance to this aspect, resulting in people always giving priority to science buildings and spamming academies a.s.a.p. and a.m.a.p.
Pushing another thing up to that level would be worth exploring, though you'd have to disconnect aspects of it from Science progression in the first place.
That's the idea:
- Focus too much on science and you'll have more stuff [improvements, buildings, wonders], but lack important bonuses [culture] and advanced military [affinity]. Still, you'll have spies MUCH earlier!
- Focus to much on culture and you'll be the "lord of bonuses", but lack infrastructure [science] and military [affinites]. Still, you'll swim in gold [industry] or be VERY healthy [prosperity] long before others!
- Balance things and you'll not only ok in all aspects, but ahead in military [affinites] and able to try a rush or whatever. Or not, if you spead you affinites [3 of each instead of purity, for example]. Still, you'll have free roads AND super-scouts [stronger on defense & immune to miasma] much earlier!
There are a lot of possibilities, all better than just rushing labs + networks + cognition and spamming academies all the time.