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I'm glad you asked because I've sort of been meaning to look into that.
I have 4 8TB drives that have ~64,000 hours (7.3 years) powered on.
I have 2 10TB drives that have ~51,000 hours (5.8 years) powered on.
I have 2 8TB drives that have ~16,800 hours (1.9 years) powered on.
Those 8 drives make up my ZFS pool. Eventually I want to ditch them all and create a new pool with fewer drives. I'm finding that 45TB is overkill, even when storing lots of media. The most data I've had is 20TB and it was a bit overwhelming to keep track of it all, even with the *arrs doing the work.
To rebuild it with 4 x 16TB drives, I'd have half as many drives, reducing power consumption. It'd cost about $1300. With double parity I'd have 27TB usable. That's the downside to larger drives, having double parity costs more.
To rebuild it with 2 x 24TB drives, I'd have 1/4 as many drives, reducing power consumption even more. It'd cost about $960. I would only have single parity with that setup, and only 21TB usable.
Increasing to 3 x 24TB drives, the cost goes to $1437 with the only benefit being double parity. Increasing to 4*24TB gives double parity, 41TB, and costs almost $2k. That would be overkill.
Eventually I'll have to decide which road to go down. I think I'd be comfortable with single parity, so 2 very large drives might be might be my next move, since my price per kWh is really high, around $.33.
Edit: one last option, and a really good one, is to keep the 10TB drives, ditch all of the 8TB drives, and add 2 more 10TB drives. That would only cost $400 and leave me with 4 x 10TB drives. Double parity would give me 17TB. I'll have to keep an eye on things to make sure it doesn't get full of junk, but I have a pretty good handle on that sort of thing now.