[Wazzymandias]

It depends on the definition of "relatively simple features"

Mismanaged startups can have a lot of technical debt as a result of pivots, shifting priorities, weak engineering and an emphasis on being feature factories. As a result you can get to a point where even a relatively simple feature takes months because of massive technical debt.

Shipping early and often while giving engineers the space to tackle debt is important. Good hiring pipeline for competent product focused engineers can help mitigate building castles in the sky. That and/or having a good CTO.