Piggybacking makes it easier to accidentally stumble across questions we didn't know to ask, but makes it harder to find questions we're deliberately searching for. However, that doesn't mean we miss out on stumbling across related questions.
When two questions are intimately connected such that each can't be wholly answered without addressing the other, they should obviously be united as one question; two questions that are closely related but could be answered wholly if kept separate, should generally be kept apart to make it easier to find them.
Here's the good news: there's a "Related Questions" sidebar on every question page. It's pretty good at finding related questions! This is the mechanic you're looking for to find questions that you wouldn't have thought to ask on a subject you're already curious about.