Lambda et al have some serious shortcoming and a lot more work needs to be put into these serverless platforms. The approach they're taking I don't think will last. It really needs a redesign/restructure.

I think serverless is the future... but not today.. in 5-10 years. That sounds like a long way off, but it's not.. it'll pass in no time. And maybe they'll improve it enough by then to make it viable.

I wouldn't build anything serious with it, unless you're ok rewriting it a few years from now.