Isekai Nonbiri Nouka Episode 6 Discussion

Of course this alleged farming tool would immediately end the wyvern "threat" by turning into a legendary spear. Doesn't appear as if any problem in this anime is allowed to exist for more than a few seconds, so why bring them up in the first place?
What are you on about? How do you think a genetic load is purged? Because it's the exact opposite of what you're questioning that results in its initial accumulation.

Because inbreeding doesn't magically produce bad genes on its own, and only expresses (or reinforces) existing recessive genes a population already inherits, deleterious or beneficial in nature. Given that this mutational load already accumulates in an outbreeding population, to the point where mutations will again compensate for the initial fitness gain with a decrease in fertility; it can be assumed that any instances of selective pressures would result in harsh population dropoffs as a consequence. Rather than having a founding population avoid it entirely, there should be a balance met between genetic relationship coefficients, meaning even something like two different inbred strains in the population could be crossed while still resulting in hybrid vigour, in addition to a reduced cost of sex and increased expression of beneficial recessive phenotypes.

Seeing as the population of the farming village in this setting is already a decent size, the population established within a few generations of what is essentially going to be panmictic breeding within a somewhat insular community isn't going to have to actively adopt any specific breeding strategy to be sustainable, especially seeing as everyone there is already demonstrably healthy.