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I am less dubious than before, but am still strongly of the opinion that QLC should never be used as an OS drive. However, has a secondary drive, I think the durability has made enough progress that using a QLC based drive is ok.

Glad to hear that. You can buy a used or open box 512 GB or 1 TB Kioxia XG6 (which is a 3D TLC drive) on eBay for about the same price as a brand new Crucial P3 direct from Crucial costs, which causes me to ponder. 3D TLC will always be better than QLC but the P3 does come with warranty for the same money

and I think it may actually perform better in some cases. Both are very efficient drives, although the P3 has a considerably lower active idle consumption.

I would nudge you toward the TLC based drive, even if used.

At first this was just a hypothetical/theoretical thing that I was pondering. But I think I may actually get a 1 TB NVMe drive for my new build (and put one less 4/6 TB HDD in my planned storage server) as I don't actually really need that much space and SSDs do have a lot of advantages.

Ideally, I recommend a 2TB TLC based SSD and a 4TB, 6TB or 8TB hard drive for mass storage. The price difference between a 1TB and 2TB SSD is not that great. The extra space will be worth it.

I think I have become a bit of an SSD geek, to be honest. SSDs fascinate me way more than, say, graphics cards and even CPUs. I also like that you can upgrade pretty old and very modest systems with them. I have bought SanDisk X300 to replace the 860 in my 645 G1 since it has half the active idle consumption.

yeah I have used 4/6 TB enterprise drives from parts dealers on my eBay watch list. I also bought the X300 from one of those dealers for $18. It is a really nice (older) laptop drive: 100 mW active idle (also supports DevSlp), MLC and Marvell controller. I am trying to squeeze as much battery life as I can from the 645 G1.