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Most people find quite the opposite.
Whether or not there are texts, the practice of being in front of a class and having advice given on timings, style, confidence, lesson planning, etc is very valuable.
I understand that most CELTAs and CertTESOLs use a textbook but encourage them to be used as a guide not bible, and in 'real life' there are vast number of different types of school, classroom and policy which leads to a vast array of possible levels of textbook usage.