Exactly. These were foods for US "latchkey kids" in the 1970s and 1980s, not "midcentury" (think Mad Men early 1960s) foods. During this time the rise of having two working parents (or because of rising divorce rates, a single working parent) combined with inflexibility of employers to allow "flex time" as they often do today, meant that many children often had to prepare their own meals. So simple frozen foods were common as even a grade school child could prepare them.