I'm working on something that I think might solve the problem in any language (currently have an sdk for typescript, and java in the works). You can avoid splitting an application into 100s of small short-running chunks if you can write normal service-orientated code, where lambdas can call each other. But this isn't possible without paying for all that time waiting around. If the Lambdas can pause execution while they are blocked on IO, it solves the problem. So I think durable execution might be the answer!

I've been working on a blog post to show this off for the last couple of weeks:

https://restate.dev/blog/suspendable-functions-make-lambda-t...