Would it actually make it more balanced if zerg could produce spines and spores without any cost to larvae, though? You'd be able to drone up like a madman and not actually worry about timings at all because you're producing spines super easily from your spawning pool.
I think you're trying to say that making zerg more similar to terran and protoss in the respect of linear production would make it more balanced, but tbh, you'd have to change how drones are produced as well. Larvae is a resource for zerg that has to be taken into consideration on top of minerals, gas and supply. If you suddenly make it so spines and spores do not cost any larvae, then suddenly the zerg race will have a much easier time producing a ton of units.
I think some of your points were valid, but your solution doesn't match up too well with those points when you actually consider the larvae mechanic of zerg.
Edit: Also, that philosophy stuff you said is true in an isolated environment, which this isn't.
Why do you ignore that zerg are also sharing their economy with the overlord?
And no, being able to lineraly produce defense from a single building, that being the spawning pool, would not suddenly allow zerg to mass up drones with out having to make offense.
it's like I said in the original post... if zerg split spine and spore production at the hatchery it would make macro stale because zerg would just be matching in power defense to the offense that t and p always have lying around with dual hatchery production...
But remember, this would also be shared with queen production, and teching so there are some major interruptions there....
This is why a single building with the linear production of defense is the "Degree" that retains interesting functionality of gameplay.
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