Most of this makes perfect sense, but allow me to disagree with one point "Those kinds of decisions are much more important than what stack you build" the most technical founder should never lose focus of the importance of this. Of course, if you don't have a business it doesn't matter what stack you're using, to build a quick RAT (yes RAT, not MVP) you don't need to go deep on the stack, but once those experiments are moving forward you've to be careful. You've to pick the right stack and tools to build your company, focus on that even more if you are a technology company (not a consumer one). This won't only be part of the scaling plan of your company but it'll also play a big role on recruiting if you're using new technologies you've to train people if you're using more mature technologies you probably have a better hiring pool in one than another.

Plus, you need to be able to share with your team the importance of picking one stack over another, the cycle of development and the times to invest in refactor or why to re-build something that started as an experiment but now needs to scale.