I don't believe in rushing. Cutting corners and doing a sloppy job always ends up biting you in the arse.
Slow and steady wins the race. Quality beats quantity. Almost all projects are a marathon, not a sprint.
What's the point of rushing to meet arbitrary deadlines? Focusing on quality means the final product will be supreme, even if it takes longer.
Look at the world's best products. They're all built by craftsmen. Such as Swiss or German engineering, or Steve Job's obsession over quality with Apple. Which product would you rather buy? Obviously the one that's highest quality.
Sure, there's certainly a market for people who don't give a shit about quality. But who would you rather serve? Those who pay a premium for high quality services because they appreciate it, or the masses who pay the minimum for a turd? The latter typically ends up being high-maintenance, too.
The details matter. Even if it's something that appears insignificant, such as a button being out of alignment by a few pixels, that one insignificant mistake is a sign of laziness. The sloppiness inevitably bleeds into the rest of the work the person is doing.
The amount of stupid mistakes I've seen people make is ridiculous. Many of them are trivial and should be obvious to anyone who cares. They're everywhere. Most of them are very easy to fix, too. Addressing them would result in a much cleaner, seamless experience, and is therefore worth the effort.
What's behind the curtains matters. Your front-end can't be marvelous, whilst there's a shoddy back-end behind the scenes. It's two sides of the same coin. The attention to detail of one will impact the other. If one is crap, it will hinder the workings of the other. And if quality isn't a value adopted by all members of a team, the project will always stumble.
It's not just a monetary decision, either. It's one of passion. Who wants to write shitty software? Writing bad code isn't just boring, it's painful. Writing good code is a pleasure. The best engineers and craftsmen are attracted to companies who value this, therefore it ends up being more productive in the long run.