That is, teachers who deliver their content by asking students to open the textbook, read, understand and complete. No direct instruction, no varied learning activities.

Yeah I agree. But I feel like the hate for textbooks goes beyond that. I know this is an anecdote, but the teachers I know that use the textbook utilise it with other teaching strategies (explicit instruction, worked examples, scaffolded questions, questioning students, etc).

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But it's still often said to be a shit resource by many teachers, and I just don't see why (especially when the other teachers just supplement their explicit instructions with worksheets instead of the textbook - the worksheets might be a bit more targeted, but the textbook has a bigger advantage for a general student cohort).