All art requires experience, but experience alone won't cause a person to become creative.

You can make a child draw a hammer every day.  Some will dutifully do it and eventually produce excellent facsimiles of hammers; others will eventually produce good enough hammers but innately want to draw something else.  

In software architecture, the degree to which a person wants, and can achieve, the latter is a measure of artistic ability.  IME, without it everything looks like a nail, and you get paintings of very good quality, maybe even impressive multi-purpose hammers...but you'll certainly never get a Mona Lisa, unless that person evolves while they're with you

Not all projects need a very artistic/creative architect; artistic ability is a spectrum people are on throughout society, and different projects have variously different needs.