Is this really true of the startup world? What possible business reason could there be for swapping your stack / tooling 3-4x per year? Do you mean learning so

Is this really true of the startup world? What possible business reason could there be for swapping your stack / tooling 3-4x per year? Do you mean learning something new 3-4 times per year that is unrelated to large architectural changes? In terms of 'on your own'--I don't know, maybe this person has a life outside of writing code?