A few years ago, I used to attend lot of sessions called Ask Me Anything's (AMA) on the Microsoft Tech Community. These were great because if you weren't an MVP or part of a big partner organization it gave you access to the product team to ask about upcoming functionality and roadmap items. I remember asking about Teams' default download location in a few of these sessions and if this could be modified. The answer was always 'no' or 'this is something on our backlog'. But the reason I went on about it was because downloads in the desktop client were going local - not to the cloud and that was something which couldn't be modified. Downloads weren't picked up on OneDrive Known Folder Move (KFM) and the inflexibility of a fixed location was always a negative. You had to resort to manually moves. Your desktop and web client were always out of kilter. Nowadays? You probably could have done it with RPA but that isn't really an answer for why functionality wasn't already built into the desktop. It's here now - at least on the desktop client for Windows in public preview.