I don't know which floppy drives you used, but the ones I did had no push-button. It was software only. I skimmed through the models in Wikipedia and couldn't see any with manual ejects.

https://upload.wikimedia.org/wikipedia/commons/d/df/Macintos...

https://upload.wikimedia.org/wikipedia/commons/c/c9/Macintos...

https://upload.wikimedia.org/wikipedia/commons/b/b3/Macintos...

https://upload.wikimedia.org/wikipedia/commons/8/8e/Macintos...

https://upload.wikimedia.org/wikipedia/commons/2/2b/Power_Ma...

I don't think he was thinking about Mac.

https://upload.wikimedia.org/wikipedia/commons/1/1b/Floppy_D...

To my knowledge the Mac has never had an (easily usable) eject button. I remember it being really annoying because a couple times I had to get the disk out and the computer wasn't working, so I had to push one end of a paper clip into a tiny hole next to the drive.

On unix at least (linux and aix) there was mount / umount of a floppy, which should always be done before removing it from the slot. Linux couldn't force you though, but it was good practice.

Depends, you could mount it with the sync option. This would make all writes happen right away. Not recommended on FAT formated flash devices btw, as it will cause massive amounts of writes to the table.