I think you make some good points, especially for homeschoolers who aren't in a position to make use of quality dual enrollment. We are fortunate to be in a state with better than average access to dual enrollment for homeschooled students (and others), including guaranteed transfer credit into state four-years when DE credits are taken at CCs. (I realize that doesn't translate to transfer credit to privates, but it does at least provide a marker of some kind of standard for those courses.) I suspect DE will become increasingly important for homeschoolers, in the absence of standardized testing. (Actually, it just pushes the standardized testing to the college/universities, where many of them use CB's placement exam suite, Accuplacer.)