patrikg - that's what I was thinking too ...
Weird timing - I just got an education about these cards, probably more than I want to know from tkaiser over at the armbian forum. I've never seen that kind of detail about them before:
https://forum.armbian.com/topic/954-sd-card-performance/Actual measurements, other than just mere speed of r/w, and some good advice for those seeking the longest longevity.
The quick gist of it is that from now on, I'll be using quality cards with 32gb or higher capacities with piCore, because of the additional spare remapping capabilities, AND at 32gb or higher, many cards may have more than one controller on board to manage it. If I feel frisky, perhaps incorporating the zfs filesystem might be in order, but I'll have to do more research to see if it actually fits the "use case" we have with tc/picore/dcore.
I think that piCore, like Armbian, is kind to sd cards, -if not more so- due to running in onboot/ram AND saving all the user data as just one mydata.tgz file to transfer. Lovin' 'core all the more!