Hello,
i write to bring to your attention a great free tool made by Oliver Hotz:
https://heimlich1024.github.io/OD_CopyPasteExternal/
It simply does what it states: copy and paste objects between most 3d apps.
If you happen to work on a multi-software pipeline, you'll easily understand this is a true lifesaver and something with no alternative on the whole market. No more I/O mess needed.
This tool is open source, so anyone can contribute using Python.
Max part needs improvements since it allows to copy and paste geometry only but no other info like UVs. It would be great if someone picks up the challenge and helps in bringing this awesome project ahead.
Best,
Paolo