I had a lot of stuff invested in the DOS 3.3 version of ACOS too, and
time spent on modifying - upgrades and moved new drivers over from the
ProDOS releases. I hung on hard and long to the DOS 3.3 side of things
until about a year after the IIgs came out.
One day, someone came over and noticed that my hard drive booted into
ProDOS.. yup. I copied all the stuff off the 400K volumes and
repartitioned the thing. Swapped over hard. Couldn't handle dealing
with ShrinkIt files that had to be broken up to fit on floppies to
move them, any longer. Too much hassle. That was it. Done.
Yes, DOS was pretty close to heaven for 140K floppies, but as
capacity went up to 800K and then to hard drives, ProDOS was the
only practical approach.