In February 2019 I decided to try retrieving some information from some 5.25" floppy disks for the Apple 2c we had since the 80s. They had some of the first bits of programming I had done amongst other things (school work etc). Using ADTPro I think I only encountered 1 disk which I couldn't transfer - I've got 19 of them. I was then able to get information off them quite easily. So you may have more success than you think.

I notice now the internal drive of said 2c isn't working and won't boot anything (I could get ADTPro onto a spare floppy without booting anything). I did use it to do the transfer in 2019. I can boot from an external drive with some patching from the monitor program. I suspect the drive either needs heads cleaning or some realignment, but I haven't had more time to try.

Sadly I no longer have my A1200 (or A600). I have a few disks from it still.