I realize most colleges no longer require it, but are middle class kids still expected to submit writing scores, as they are for the SAT subject tests for top colleges?
You mean the essay? The answer is simple: it depends on the school and you have to check for every school you’re applying to.
Many colleges no longer require SAT w/ essay. You can check the requirements for your college and decide or you can go ahead and just take it. It is not the same thing as SAT subject tests, which are strongly recommended for selective schools.