Yes you should. I think most comments here are about products that have millions of users where it's actually worthwhile spending all that extra time and money to perfect things.

For most development, it isn't worthwhile and the best approach is to wing it, then return later to iterate, if need be.

The same goes for most craftsmanship, carpentry in particular. A great carpenter knows that no-one will see the details inside the walls or what's up on the attic. Only spend the extra time where it actually matters.

It triggers me immensely when people say "I could have made a better job than that" about construction work. Sure maybe with twice the budget and thrice the time.