Why do you say that? Start-ups by definition need to move fast and test out hypothesis. With a tool like Avo you could prototype something, get it out to your customers and get feedback fast.

The secodn use-case is internal tooling. When I worked at a start-up we had a lot of "shady" internal tools built fast, crappy and unreliable (because it's just an internal tool) and we always had issues working with them.

I build a lot of internal tooling using Avo and the process is quite painless.