Hi, @mia, to add my vote as well as my use case to this:
I am assistant director for a theater production that developed the characters and script during the ongoing production and to support this, we recorded all of our rehearsals on video and made them available to the cast and crew on my Google Drive.
I always used to mirror my Google cloud to my PC storage, but since all the video files (as our production draws to a close) are clocking in at about 1.2 TB, I had to switch to streaming mode on Windows, since I don’t have that much space available right now.
Having recently switched to EndeavourOS, I found Insync to be far and away the best client to replace Google’s Backup & Sync app, but due to the absence of streaming mode, I can not use it in practice right now. Since the Google Drive quota can go up to - I believe - 30 TB and I can see many people having storage extension as one of their primary reasons for using a cloud service anyway, I think there’s a solid case for streaming mode as a priority feature to be implemented.
Thanks for your support and for taking this with you to your engineers!