Villager profession distribution can be very unbalanced

I came across a seed where 2 of the 3 villages I found have a very unbalanced distribution of professions. (The 3rd village being too small to say)

One village has no villagers with a profession. (Illustrated in the Plains village pictures attached)

Another village seems to have exclusively farmer villagers, (Illustrated in the Taiga village pictures attached)

I've attached the worldgen export for this overworld seed "1409477897665732076"

It was odd and off putting to search for and find these villages which turned out to not be useful or interesting.

I would think there would be a rule that ensured a more even distribution in order to prevent this.

Thanks!