Stopped reading at proprietary. Seriously why would I care tying my app to something proprietary and have no way out of it?

What makes you think you can download it and use it yourself? This is just CloudFlare discussing their internal tech stack.

I meant the I have no interest in knowing anything about any company's internal tech stack and also no interest in tying my application to one company's internal stack. Much of it sounded like lock-in to me.