When I wrote all about concurrency I argued that all code should be async by default—like Go or Crystal—since there’s already so much implicit behaviour going on in your typical program, you might as well get low-cost I/O while you’re at it. I do think there are contexts where it’s useful to know that you aren’t going to suspend for an arbitrarily long amount of time, like a UI handler, and having the ability to write APIs that require no effects would allow these kinds of guarantees.
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