> Lime is more breathable, workable and sustainable. The only thing is, it requires maintainance

What sort of maintenance does it need?

It wears down quicker than concrete (you can scratch it easily with a nail and minimal pressure). But we’re still talking 50+ years (before repointing brick, in my case). As long as maintained it’ll last forever (our home is 140 years old, I just re-did the pointing, should be good till I die).