I think this is a bit myopic. If you have a tech. This tech has been in the game for several alphas now (as most eco techs have been). But in the next release this tech has another tech paired to it, what have you lost? Haven't you now gained an additional choice?
Tech pairs are great for certain cases, like some unique techs. But If you make everything a choice of one over the other (like all the eco techs maybe), you are forcing a very black and white strategy on players. In my opinion, picking a path down a specialization tree isn't good strategy, that's why I oppose choosing heroes at game start, aoe4's monument system, and civilization specialization upon phase up.