iserith
Magic Wordsmith
https://twitter.com/mpetruzz?ref_sr...sageadvice.eu/2016/05/15/the-disarm-maneuver/
To add more confusion to the conversation, just found this April 26, 2016 Sage Advice tweet from Crawford that never made the errata Sage Advice: If you disarm on your turn, you can pickup the weapon.
However, I'll stick to my earlier post that I believe his reply would violate "controlled space" of another, we have existing rules that can deal with getting stuff from controlled spaces, and there's no specific rule in Disarm to the contrary.
This appears to refer to the BM maneuver though, not the Disarm action option in the DMG. Either way though, I see no issue with picking up the dropped weapon as an object interaction. It can be tricky though - you need a hand to do that in my view. Someone who is sword-and-board has some choices to make there.