This doesn’t work in Firefox; this doesn’t work in Safari; this is broken on Chrome, ok the last one is impossible :) But how often has your new feature not worked well in all browsers? Or how many times something produces troubles after a while because the code base has changed?
Fixing all and not having bugs is impossible but mitigating them is part of your job.
In this speech, you'll see how it is easy to create e2e and component testing with Playwright, to prevent mistakes in production. I forgot, a quick look at how to test API is a must.