The difference is that it’s not a plugin anymore.
The only API offered is signing/sending .3mf files –
everything else is only in Bambu Connect, but not available to other tools anymore: No syncing AMS filaments, no access to cloud-synced print profiles, no manually moving/heating the printer, no monitoring progress, no access to the camera etc.
So yeah, Orca could probably implement a new “Send” button, but the “Device” Tab will be gone and preparing prints would also be a lot worse…
I still don’t fully understand why they’re doing this. If they did it to Bambu Studio as well, then it would make more sense (not linking their closed-source plugin against the GPLd slicer anymore, finally complying with the license), but as it stands it seems they’ll only kneecap Orca (and any goodwill in the community around it).