My question is hence, without any polemical intent, what is the technical reason for avoiding this capability to linux users?
"..., What is the technical reason ..." You raise the bar too high. Did you have seen any decision made and "technical reason" pointed?
Technical reasons aren't something leading for Dropbox! Have you seen the discussion for FS restrictions? Is there any technical reason?! There are lot more similar examples. Just company politics, unfortunately. You shouldn't look for non existing thing. Python programing language, QT underlying library,... everything multiplatform - there is not actual reason!
The only thing such "extras" are waiting for is business decision. Nothing more.