Yeah. Still way more effort than Kobo: plug it in, drag and drop.
The workflow is plug -> web browser -> remarkable IP -> drag and drop.
Anyways, I think I could have dealt with it if it handled large books fine.
The web interface also has a couple of other advantages: the tablet simultaneously listens for ssh connections, and can be used over Wi-Fi, IIRC? Though it could also expose a "USB HUB" with both the network interface and block storage.
I just wish we had a more ubiquitous "network file storage" protocol. The tablet itself could offer NFS, but mounting it under different operating systems would be a pain, requiring manual user intervention.