My previous experience is with dropbox and onedrive and I tend to limit bandwidth ... I want sync to happen in the background. It's not something I usually consider "high priority"
I found NC to be a lot more flexible and complete, specially with all the machine learning options. I also appreciate the privacy and price Hosting about 7TB of data for $10 worth of power a month and a $150 investment that allows me to host many other things.
The web interface in my case is a bit slow initially but that's mostly because I opted to route it via pangolin reverse proxy / cloud flare tunnels, but I notice once the redis cache DB loads it's blazing fast.
Overall I'm pretty happy with the speed, I'm sharing this with a family of 15 and I haven't heard any complaints yet.
Interesting,
I've automated deployment with SDNET and templates, but the other stuff you're doing with terraform is more akin "Orchestration" There must be some GUI for terraform that works with proxmox.
I guess you could do the same with expansible and playbooks but it sounds like you're looking for something with a GUI that does the work for you.
I can't think of any, but proxmox does have an API ... wondering why no one has done this yet ....