Of course, the subsidy can help in ways that would not diminish the tentmaker's credibility. But more of that later. Applications to mission agencies. Some mission agencies require that all of their overseas people take two to four years of Bible and theology. Tentmakers associated with mission agencies would have to meet this requirement, but this causes trouble when they apply for jobs overseas.
Potential employers spot the Bible school or seminary education and reject the applicant.
You can omit this education on your resume, but not if it took a number of years. A four-year hiatus will be suspicious. On the other hand, the Lone Ranger avoids this difficulty. He or she has a resume with no awkward facts to explain. This is a considerable advantage.