Exactly, and with productivity modules and research in SE (vanilla) even something like 50% productivity is high (especially before leaving nauvis). For military I use laser turrets laced with ammo turrets using modded almost free copper bullets (1 copper plate per 1000 magazines), but the sheer cost of laser turrets is sooo huge in iron in SE and you need so damn many of them (compared to BA). maybe using flame turrets would work better, I did have plenty of oil for them. For clearing nests I was using flame tanks for small to medium nests, worked fine, just a bit too tedious. For larger nests flame tanks are too weak so I had to make a small army of laser tanks. It was a huge pain in the ass clearing even that one single nest right next to a big iron ore deposit. THE ONLY iron ore deposit outside my base I have not yet claimed as far as I had vision...
I have only SE, so best recipe there is to procces ori is to mix it with vulcanite and it gives I think 8 plates per 5 or 6 ore?? So maybe Krastorio would have made this better if it has better efficiency. I do put productivity modules wherever possible. Then again, I am probably just way too used to BA infinite ores where even a single deposit is enough to run a large base forever with no problems...