A big complaint with tree seeds right now is that trees can't be planted outside of region, so what's the point?
I had a few ideas to keep the game balance and require constant effort.
If they want to force biome specific planting, then you should either be able to plant trees with a big debuff to growth times and yields, or allow us to terraform spots that we can plant trees on that become "uprooted" and reset to base after the tree is cut down. Or change recipees for trees, and make biome specific materials required to make the saplings you can plant, implying you have already set the plant up in a way for it to thrive no matter where it is set.
Anyway, those are my ideas.