I think it behooves us to be selective right now. Frontier labs maybe great at developing models, but we shouldn't assume they know what they are doing from a product perspective. The current phase is throwing several ideas on the wall and see what sticks (see Sora). They don't know how these things will play out long term. There is no reason to believe Co-work/Routines/Skills will survive 5 years from now. So it might just be better to not invest too much in ecosystem upfront.
You may want to check out Barnum, which is a programming language/agent orchestration tool that makes it easy to build things like /loop, or Claude code routines. And you won't end up dependent on the specifics of how Claude code routines work!