Not sure I understand the question, but I will mention that when I played lower levels, I was quite a "I can squeeze this in" kind of techer.
As I have gone up in difficulty, I am not so unfocused. I wont try to squeeze things in, or suddenly switch tracks.
Ever see some of Rustens games where he doesnt even know Archery at 1400 AD? Thats focus. Me, I would have "just squeezed in" the 1-turn somewhere. Not him though. He didnt need it, and isnt OCD enough to get it for the sake of order, heh.
But I never changed techs in the middle, not sure who does this at any level, so your question is a bit confusing. Is there a guide somewhere that actually encourages mid-tech swaps?
For example: I'm playing an OCC with a industrious leader. I'm researching sailing and building the oracle when I notice that I don't have pottery yet. Obviously I'm going to need pottery and sailing both, but in order to snag metal casting with the oracle I'm going to need pottery sooner, even though I've already invested two turns of research into sailing, so I switch before I finish.
I've noticed in some of the write ups that a lot of monarch and above players despise switching techs after beakers have been invested. Why? What's the big deal?
Beakers decay when you're not researching the tech![]()
I switch research quite frequently trying to get something to trade before the AI gets it or from just realizing getting another tech right now would be a better strategy.
The same thing applies with builds, I'll build something for a couple of turns then realize "I don't need this, I need that" and switch. It might feel like a waste but immediately correcting your mistakes instead of doggedly pursuing a path just because you happened to choose it initially can only help your game.
I'll even let production atrophy sometimes if I decide I don't need a build for a very long time/forever such as a part-built unit.
Doesn't it take 10 turns for research to atrophy?
Usually I don't switch techs mid turn unless I've made a mistake but I imagine someone with good espionage could try to get some late tech with liberalism and would have to abandon some tech for liberalism in order to win the race.