Partnering with a sending organization, while not necessary for a bi-vocational worker, can be beneficial, and for some workers has proven both necessary and wise. A covering of protection and sense of belonging come with a sending organization, and you can find greater effectiveness and accountability within an intentional community that is made available through a sending organization.
A sending organization attracts a certain type of person who has agreed to certain standards and vision, which in turn provides legitimacy to the worker. When you meet other missionaries in your location, those missionaries have an idea of who and what you are about. Veteran missionaries’ lives may be very full at present and adding a solo worker who is not in the flow of an organization may require more effort than they have capacity for, leaving you, the new solo worker, alone.
Bi-vocational workers currently on the field with sending organizations believed it was important to be sent. The idea of “being on their own” without the support and training that a sending organization provides was not how they wanted to “go.” They have found that the fast-paced working environment of their locations leaves little room for spare time and hobbies, and they have benefited greatly by being on a team that is intentional with its time (training, prayer, and fellowship).