> fast iteration beats pixel-perfect control

Wait until you work with a professional designer. They insist on perfection. Can drive me nuts.

But I have to admit; the projects that I’ve done with designers, are a lot more popular than the ones I did, myself.

Can understand – depends on the designer though! ;)

I've had both experiences. Good designers push you to make things better. But some insist on details no user will ever notice. Finding the right balance is key.