I mean, personally, I just want one to have one - like for the joy of it. I'm not the type of player who min/maxs everything. I also didn't think that getting quartz and smelting it in a couple of bloomeries was very much effort on my part. I was going to get glass anyway.
Haha yeah, it's not the most efficient route, but I'm okay with that! For right now, I just want enough for bombs. I also like how the greenhouse separates the flax from the rest of my crops; it's more of an aesthetic thing.