Good teaching is a highly-skilled profession. And it requires a lot of very robust interpersonal skill - (something the new batch of Millennial and Gen Z workers are bad at). This skill is rare, getting rarer, and becoming expensive.
Because these workers are expensive and rare, districts can only respond by making the jobs easier and more attractive. And a lot of the "equity" initiatives are just that - at their heart most of them sell teachers on a justification that methods which require less rigour are better.
And at current trends it is getting really hard to argue that a high school is much more valuable than just a daycare for teenagers (depending on who you ask, this may already be the case). If there is not much rigor or motivation being offered the students, there will be a natural regression towards student success entirely being driven by home life.