Not sure I can remember the last time I needed to reorder aggregate device components but new features are cool none the less.
The point was more about a bug/omission that allows the installer to install to unsupported hardware (a HDD in this case) and thus cripple the performance of an otherwise fully functional machine.
I sort of suggested it followed to avoid 10.15 altogether and that's fair to call out! I meant that more as: Don't casually upgrade unless you're prepared.
Hmmm...
Might be a good time to start looking for 2012-2014 iMacs on Ebay that are "suddenly slow and crashy after upgrading to 10.15. The genius bar said it couldn't be repaired..." and start sniping!