I don't think it's important. Some of the best writing/articles are what they are because they're well researched and provide more information about the subject (in one place) than most of the other stuff out there offers. If someone's going to use that approach to his Hub, however, I think it's very important that he put together a Hub that isn't a re-hash of the same stuff that's found "everywhere else" (and often on a site that's far more authoritative than a writing site). Knowledge of the subject or (as Google describes it) "intimate familiarity" with the subject can help a writer recognize the best resources for research; and knowledge of the subject can help a reader recognize a different angle from which to the approach the subject. So, intimate familiarity with a subject never hurts the writing, whether or not the approach will be "completely objective and from research" or "from personal experience" (with or without research included).
Having said that, I think personal experience can offer a writer a view of the subject that can make a difference in whether or not the material is unique. The thoughts/feelings we have when we go through something can be things we'd never have imagined without going through it. We learn. We see more of the angles to something. Including personal experience can increase the chances a reader who has been through something similar will think, "This person knows what's it's like." It can also help increases the chances that a reader who hasn't been through something similar might think, "Wow. I never realized that's something someone in that situation might think/feel." Including personal experience (when I've done it) has helped me write from a more unique perspective. Something else is can do is offer something different and unique, rather than the same re-hashed stuff that's out there and available to anyone who searches.
So, I think personal experience is always valuable to a writer, but I don't think including it in some writing is always important. In fact, with some writing, it's important not to include it.