I did a banner for a lady two summers ago. She was a neighbor of mine and she taught graphic arts at a jr high in the area. I thought she understood things. The admin staff for her school had all created bitmoji's on their phones and they sent them to her for a banner. I blew up the bit mojis to a 4'x8' banner and they were (GASP) pixelated. I tell that to the graphic artist and so she says, "oh, no worries, I will add pixels". So, she does..and it doesn't make it any better.
So she has to use the people's actual photos...which, in the education world, that's just not as fun...whatever. So then she sends me a file and I tell her it's super pixelated and she says, "HOW? it's a PDF?" So, I tell her, just because you took a jpg and exported into a pdf, the original image is STILL A JPG. SHE'S A GRAPHIC ARTIST! SHE TEACHES GRAPHIC ARTS...