…noting, of course that once or twice a day, which is what interested users want to achieve here, is NOT “very often”.
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Yep, agreed.
In the request, someone actually made a calculation showing that spinning the drives up once every hour (24 times a day) was still within specification for many years 
I want to point out that I am on the latest stable TrueNAS OS, and I find each morning my server running quite. I have set up spin down after 60min, and it is the only moment where I can find it spinning down.
I cannot say when it starts, and how long it last.
The disks a read or written each day at 00h for snapshot, at 2 in the morning, I have all the aar apps checking and jellyfin as well, and otherwise, I have Nextcloud connect to the drives via SMB.
So there no frequent access during the day, and the very frequent access are made on dedicated SSDs (for apps and containers).
The disks are used for main storage, but for personal use only, so not very frequent.
>someone actually made a calculation showing that spinning the drives up once every hour (24 times a day) was still within specification for many years
That was me I think. It’s not that many years, only 410 (for 150k load cycles). So if you put your HDDs in a generation ship and send them on a 20,000 year journey to another star, they’re not going to last that long if you spin them down every day.
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While I don’t dispute your logic, Load Cycle Count != Spin Up/down. Those are different actions and stats which often can correlate but don’t have to.