Because entrepreneurship, which is a risk-taking venture, must encounter challenges, one of the most important things an entrepreneur can do is to upfront consider how to deal with the headwinds that are certain to come at some point. If an entrepreneurial venture is started by more than one person, it even needs more meticulous planning. See, it takes very little provocation for partners to fall out. This is because to have people pulling in the same direction, and shunning disagreement at every turn, is almost impossible.
Going it alone will certainly give you full autonomy and control of your business, but a partner may allow you to expand into a more dynamic approach. There are pros and cons of either choice.