I think it depends what you define as physical attraction. Take my husband, for example, whom I met via internet dating. I don't think I would have agreed to meet up with him if he didn't look appealing to me in his photographs. However, when we met in person, the things I was most attracted to were his voice, his mannerisms, and the way he smelled - instant chemistry! The more we got to know each other it transpired that our personalities gelled too and we wanted the same things out of life, so he was a keeper, but I'm not sure I would have given things a chance to flourish without that instant magnetism.
11 years on, he looks very different to how he did then, as do I (we're both permanently knackered due to demanding jobs plus caring for our disabled daughter and my mother who has advanced dementia) yet the chemistry between us is still as intense as it has always been.
In the past, I had a relationship with someone who was, looks-wise, wholly my type. Superficially, my attraction for him bowled me over, but as a got to know his personality and realised how it clashed with mine that attraction waned.
After that, I went for personality first and began a relationship with someone I'd already established a friendship with, but although we had a lot in common and laughed together, ultimately I couldn't get over the fact he felt more like a brother than a lover because the chemistry was lacking for me. The fact his voice grated on me was a significant part of that.
So yes, I do feel physical attraction is vital, but for me, there's so much more to this than how someone looks. I might see a photograph of someone and think, "wow" but until I can see how they carry themselves and hear their voice, I may as well be looking at a painting in a gallery and thinking, "that's beautiful."