Actually, it's the other way around. What's at issue here is how much you want to micromanage - yeah, you can certainly be anal about timing about all of your various abilities, yields, and so on, to maximize efficiency if you peek around at everything every turn and tune everything perfectly to maximalize all your possibilities. Will you do better? Yes. Is it worth it? No. Civ 5 takes enough processing time already - I hardly need to be dragging myself around my entire empire to make one silly tweak after another, and call that "Skill." We all have that skill, we're just not willing to invest in it because it's stupid to do so.
This is besides the fact that - while more yields are indeed better - based on number of cities, yields required for tech, or a social policy, increase by certain percents, and thus two players can have exactly the same yields that are having entirely different effects. Now I suppose I could go and fetch a calculator and do the math and see what my real yields are modified by my city numbers or whatever - again, that's more work I'm not interested in doing when I'm playing a game, but more to the point I don't feel the yields when a whole pile of numbers are being thrown at my in my capital because those numbers are dependent on other numbers that aren't always immediately available to me. It's not that I can't access them, figure them out, and so on, it's that I don't care for this level of investment in a game (against an AI no less - perhaps against a human player, but even then I'd say a better design is in order - see Battle for Wesnoth for good PvP strategy that is as simple as it gets but plenty strategic, though it has its flaws of course), and furthermore, and most importantly: micromanagement is not skill, it's just time investment. Actual skill is open to the realization that the game is more than about mere math and that there are non-calculable things going on. Once you can't nail down a number, then skill starts getting involved.
Micromanagement is most certainly a skill. You may not value it, but it is a skill.
Anyways this conversation is pointless as there is a < 0% chance I'm touching the instant/static yield balance as-is. There are many, many reasons I'd rather not delve into (for the sake of my own time and sanity) as to why a shift towards increased instant yields was a massive improvement over the bucket-filling model of civ 5. We're past this in VP's lifecycle, time to move on.
G