You certainly are mired in looking at Creation from a single point of view ... your own.
Trees bear fruit to feed the rest of creation. They bear seed to reproduce. Your notion of reproduction being inevitably tied to death is another presupposition that indicates your inability to internalize the Biblical account, that corruption, decay and death were not present in Creation until after the fall.
The carrying capacity of the Earth, prior to the fall, is not something you or I could possibly answer, since it's little understood even now, dire, death-ridden, politically Malthusian tomes notwithstanding.
>>They bear seed to reproduce.
And how many trees could have grown in the Garden?
>>The carrying capacity of the Earth, prior to the fall, is not something you or I could possibly answer,
But you do admit that there was a carrying capacity - and that it was not infinite.
Did any of the bacteria in Adam and Eve's feces ever dry out and die?
What about bacteria that were consumed by Adam and Eve? Were those bacteria immune to digestion?