It happened with the pussification of skateboarding (stay tuned, I plan to make a topic about it). It happened with the new less effort and commitment generation that we nowadays see - skateparks full of scooter kids is the finest example. Kids became uncoordinated, "skinnier" boards became "too hard, too small". Everyone wants everything "the easiest way". Shoe industry sold "board feel" as a marketing trick to sell less expense, cheaper materials and easier/faster to produce plain shoes for the same price and fucking trends made the legitimacy to all of this without questioning it.
I could care less about wide boards if market offered me selection of the shapes and sizes from most of the companies I've been riding for years, but fuck no. I'm not gonna switch my board size because everyone's nowadays riding a griddle or someone said so. Why should I? I've been riding them for years, I know better what I like and prefer. I've stayed true all these years and I will stay strong. I freaking hate when someone says that "skinnier" boards are for small feet. 7.6 was my favorite size which has become almost extinct nowadays. But because of this I've also become not picky about my setup anymore, I skate whatever "narrow" size I can get. Downside is that I can forget about supporting or buying a brand I like or want because most of them don't produce anything below 8. I switched to 7.5's because I was able to get them and been riding them for past years, I really like the feeling. Last board I got was 7.75. Not as fulfilling, but I guess I will get use to it. I've even got 7.8 at one point, but you need wider trucks for that size. Basically I'm fine with anything from 7.5 to 7.75. It sucks that some shops don't carry anything below 7.75 and even for this size they have a deck or two. Though sometimes you can get a good deal because most of the people don't skate those sizes.
I have a normal size foot, I still ride small wheels and I love to skate fast. Foremost, "skinny" boards are aesthetics and look the best.