From the other side of the red pencil, I’ll disasgree strongly with this and side with Kiminy. My syllabi always say “tentative,” I’ve been teaching the same course twice a year for about five years, and each class reacts differently. Some take more time on one topic, some take less. The syllabus needs to be adjustable to match what the class actually does.
Plus, I always want to announce at the beginning that there will be a final exam. Some quarters, if the class has done well on the papers, I tell them that the final is optional: anyone who wants to take it, I will drop their lowest grade when I do the averaging. Those who are happy with their grade to date, needn’t take the final. Alternately, if the class has not done well on the first paper, I sometimes allow that option as well, the final can replace the low grade on the first paper. However, I don’t want to announce that in the first week – the students pay attention to the readings and work harder if they think there’s going to be a final.
On the question of professors asking a question to which they have a specific answer in mind: sure, most professors do that. The good ones use it as a means of discussion and debate; the others use it to pretend they’re stirring up discussion.
BTW, there was a study a few years back that said that when a professor asks a question, and then waits for the class to respond, they typically wait about 8 seconds before they answer themselves. They, of course, have the answer (or direction) in their heads; students need time to think; but the professors dislike a “long” interval of silence, and so start talking again without allowing students to respond. You might tackle your professor privately after class, provide them with that 8-second statistic, and let it sink in.
Most schools have students complete teacher evaluations the last week of the term, which is useless. At one school where I teach, those results aren’t made available until about six weeks into the next term: so, not only are the evaluations useless for the class that filled them out, they’re useless for most of the next term, too. By the time they come around, I’ve forgot what they were talking about. But I believe that most professors are happy to respond thoughtfully to well-meaning, helpful comments offered privately.during the course. Most professors would like to get high student evaluations, and are willing to consider complaints/suggestions that are offered politely and kindly.
(“Why did you change the syllabus, you asshole” is not likely to produce constructive results. OTOH, you might find some empatheic and even positive results with “it’s difficult for me and several others, I think, when you change the syllabus, since we’re trying to jiggle papers and exams for other classes, too, and it’s difficult to try to plan our work weeks when there’s constant change.”)