on the other side of equation we have 5 drivers less, 1400 LOCs less,
no risk of losing bugfixes and features (which is true already w/
pata_rdc lacking locking fixes + Power Management and pata_oldpiix
lacking parallel scanning feature).

The parallel scanning feature is somewhat irrelevant on an original PIIX,
if the hardware even supports it which is somewhat of an unknown. If you
have a minor boot time performance concern you'd buy a real computer
instead.

And the other stuff you actually create a problem rather than solving one
- the difficulting testing the rare chips makes it harder to fix ata_piix
bugs and do full testing.

Alan