I was looking more towards something that can use my spare CPU and have enough SATA ports to last a long time.
And while USB to SATA is expected to be inherently unreliable, all PCIe SATA devices I see seem to be problematic in their own right^[doesn't make sense to have a SATA adapter that goes around corrupting the data in a way that it is hard to detect] (from the reviews).
The only one that seemed fine was the PCIe SCSI device, for which, I would be very careful, making sure I don't get a fake.
Then the available motherboards having >6 SATA ports seem to all be high end ones, which doesn't make sense considering I am trying to save some money.