Well… I don’t know that I agree with this. I think it’s OK to have your OS on the same drive you plot on. It’s more ideal to have a dedicated drive for your OS, but if it’s the difference between two NVME channels on a mobo to plot, and one NVME channel on a mobo to plot … you are really crippling your throughput by negating the use of one channel “because OS”.
Just bear in mind that you’re burning through the cells on it over time, so keep an eye on the SMART disk stats.