Your personal assets are NOT protected if you do business as a DBA. All the DBA certificate does is let people know who's behind the fictitious name that you created for your company. It does not provide you with any protection from the reach of creditors. You can only get that if you form a corporation, limited liability company, or other limited liability entity . . . AND maintain the annual records and formalities that the law requires of the entity. If you are concerned about protecting your home and personal assets (and if you're in business, you should be), speak to a business attorney.
Creating a MAP will take no more than an hour of your time every month and will keep the lines of communication open, ensuring relationships with investors remain strong, and ultimately helping early-stage startups succeed.