Just make sure you back them up. Bit rot is real.
Ajen
Did Lucille Bluth write that article?

Even things like HDDs that don't become "obsolete" in 18-24 months get sold with plenty of life left (unplanned downtime is more expensive than new hardware), but obsolescence makes it happen even sooner.
Yeah, he literally changed his last name to "dotcom."
Regardless of who owns it or what they do with it, those GPUs will get sold on the used market with plenty of life left. Older AI GPUs, networking equipment (eg 100GbE), SAS drives, etc have been easy to find on eBay and other sites for a long time, because data centers replace hardware long before it's expected to fail.
12gbps could be useful if you use port expanders to put dozens of drives on the same port, but without a port expander you're right you wouldn't saturate the 6gbps channel.
every scientist on planet earth is wrong about basic physics
Until someone comes up with a unified theory that works for both Newtonian mechanics and quantum mechanics I'd say this is true - we're all wrong about basic physics.
LSI cards are generally easy to switch to IT mode. You should be able to find a guide on servethehome.com for your model.
This, but if you already have a SAS card in RAID mode you might be able to flash IT (AKA HBA) mode firmware instead of buying a new card.
Also, SAS cables fit SATA drives, but not vice versa. So no need to buy new cables.
Not if it's for oil based paints.
If he chops it off he'll have to sit down anyway, so yeah...
It's fine until it's not... The problem is you can't really predict when it will fail.