...But it should be pointed out that by doing so Apollo break some of the timing specs. Thus, Apollo is much more prone to have timing related issues. Also I am not that sure about the "a lot faster" bit. Faster perhaps, but not that much IMO.
Also Apollo has no real SCSI, which Blizzards do have (SCSI Kit).
Apollo can't take as much memory as Blizzards.
Blizzards can be disabled from keyboard and you can use the regular 68EC020 CPU if you need to (some really picky games/demos perhaps?). Apollo can't be disabled.
Blizzards are commonly considered much more robust and better designed.
I'm not saying Apollos are useless, I'm sure they are good cards in their own way. They sure are cheaper than Blizzard, that's a big plus.