Wow. Really? Why is stability a concern? Much of engineering is making solid decisions and fucking sticking with them rather than changing to the latest toolset because that's what hacker news says is the best today. Are you trying to build a product and company, or a blog post?
Stability is a concern because startups are not stable. In 6 months time Apple could open source something that makes your last 5 years of work irrelevant in a night. If you can't ship in 6 months you're company will probably have shut up shop in 12 because someone already ate your lunch.
If it's a choice between stability (via proper testing, architecture, etc.) and staying operating, stability loses every time.
No matter what happens the tech world is a different place in a year. You have to adapt regardless so properly thought out code will get thrown out just as easily as 4am hacks.
