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That's the way I understand it as well. Coccidiostats kill worms (protozal parasites), antibiotics kill microbes... except for antibiotic-resistant microbes... which are the only ones left after you kill off the weaker ones with antibiotics. So then you need stronger antibiotics to kill the microbes that became resistant to the first dose of antibiotics you administered. Viscous cycle.
Regardless, we use unmedicated starter, because we have never had a need to medicate healthy chicks. Now, if I had a bunch of chicks get sick, I would seek out an appropriate medicine to address the problem. I have no problem with using medicine to cure a condition... I just don't see the need to use it as broad-spectrum method for prevention.