No it's not. As someone who's had 10 jobs by the time I was 25. I can attest that.
You can be 10 times more productive by picking a solution that achieves the same for 10 times less effort. And that's what you should do all the time.
Whenever you take wrong decisions (let's call that "the design phase"), you have to compensate by doing 10 times the work down the line.
That's where the experiences come in. Whatever you have in mind. Already seen it. Already done it.
In practise, that means I could play ping pong 4 days a week and still be more productive than most people, because they will do work that require a week to be done, while I will do work that require only the last day, to achieve the same result.
The downside is that it's getting boring and irritating to see other people trying to tackle the job in a way known to be wrong (which they can't realize because they don't have the experience).