Stockpiling Research does not get you faster results, or does it? You still have the same research costs and you can only discover one tech per turn.
Several techs give you benefits for being around (e.g. trade and bio techs), so you would want to have them early for their bonuses.
And stockpiling for key militry techs that you pull out if a threat arises, seems very dangerous. Having the tech does not help you until you upgrade your fleets. Only instant upgrades are planetary batteries and troops.
Basically, I don't see much benefit of sitting on a pile of unused research. I am increasing my opportunity costs by waiting instead of getting techs that make me money or population or even the big leverage facility upgrade techs.
Or do I don't see the forest for all the trees?
If there are edge cases that give you a benefit from waiting and "sniping" techs, let the micro managers have their fun
In the Civilisation series they can get to insane levels for optimizing everything and thats a valid playstyle too.
(As long it is not mandatory for normal difficulties