I think this separate room method for PCR is viable and important mostly in the diagnostic microbiology, where there is a dealing with the patients sample-- the result of which aid in the treatment and management of the patient
Yes, the idea of separated rooms for PCR laboratory is very important, especially when you work with molecular diagnostics. PCR is a highly sensitive technique, so this is to try to avoid contamination during your analysis and handling samples for PCR....that may affect your results.