Hey there! Founder of Opsmaru here. I didn't expect the post to get to the first page after it didn't get upvoted when I first posted it. Happy to answer any questions about the product and this post!
OVN is very heavy and requires a lot of management when it comes to provisioning and maintenance. So for now we didn't want to go there just yet.
We're sticking with LXD, it's been receiving a lot of updates from canonical, the team is responsive on the forum and has been a pleasure to work with.
Once we have some breathing room, we definitely want to explore incus and see what networking options are out there.
Maybe we'll just adopt wireguard and make that work out of the box with incus in a future iteration.