No, no stress is involved for avocados, or plants in general that are hermaphrodite, and most of them are [1, 2].

Do check out this article and this study. Climate change not a factor either, it was officially observed approx 100 years ago

Botanist A. B. Stout observed this reproductive strategy as early as 1927,

and the actual study (link in the description) talks from the get go -I mean title- about
balanced polymorphism as well as the ancient rhythm of daily sex alternation in avocado.

Edit: several, for clarity