I agree that a lot of it is very lame compared to other professions.
Nevertheless, it is VERY far above the uninformed and often willfully ignorant rantings of parents, and there is some serious academic and real-world work done to improve teaching & curriculum.
While parental input should certainly be considered, as a whole, parents haven't got even the first clue of what is needed for a sound education suitable for a highly complex society. Their expressed preferences are to shut down things they don't like, ignoring all consequences. And those shut-it-down impulses come from all sides.
To reduce schooling to the lowest & loudest common denominator of parental preferences would be a disaster on the scale of societal collapse.
We have the most complex society ever in the history of at least the solar system - and it is barely runnable as things are. The only way out of this will be to maximize the intellectual capabilities and scope of every generation.
Increasing qualifications and especially requiring education in your teaching subject? Absolutely. But substituting a push for that with turning it into a "Parent's Choice Greatest Hits"? Nope, it'd likely be better to just shut it down.