I studied Media and Advertising was part of it. Unless you're aiming for a niche market, then the aim is to reach the highest numbers at the lowest cost. So if somebody says to you "We need to make sure more PoC see people like themselves using the product." you have to figure out how to go about it.

Now for example, in advertising a laundry detergent here in the UK that would primarily mean showing White, Black and Asian (Indian) families using it. That means three sets (because different cultures decorate homes differently), three sets of actors, three voiceover artists and three slightly different scripts (the different cultures use English differently). So for the agreed budget, you either do three very short, medium to low quality ads, or one high-quality one with a mixed-race family. That means, say, a White father, a Black mother and three mixed-race kids, a standard set, Estuary English script and voiceover and never mind the Asians because research* shows they always use cheap unbranded stuff anyway. Your client wants the high-quality one, you've done your Equality and Diversity bit, everybody happy except the viewers who actually aren't seeing anyone like themselves in the ad because most people aren't in mixed-race families.

It is what is technically known as a complete balls-up!

*research= what your other half sees in Tesco every week.