Creator's probably could have went in the direction of a deep-dive into Apu's family. A smart-mouthed son, a bookish daughter destined for success at intellectual pursuits. They probably speak English in the same way that kids with parents whose families immigrated a couple of generations earlier did. I mean, yeah, news flash, first generation immigrants typically have thick accents. Their kids typically turn into very 'normal' Americans. Political correctness gone haywire, absolutely. They erased that story, instead of embracing it, and it really is our story.
Edit: And for what? The stale antics that the show has become known for over the last decade? God, what a missed opportunity.