I would love to work with Durable Objects and all the other cool stuff from Cloudflare, but I’m really hesitant to make a single cloud providers technology the backbone of my application. If CF decides to pull the plug, or charge a lot more, the only way to migrate elsewhere would be rebuilding the entire app.
As long as there aren’t any comparable technologies, or abstraction layers on top of DOs, I’m not going to make the leap of faith.