To be fair, saying they put them on 'everything' now was an exaggeration. You got me there. But the fashion for bigger wheels is a thing, in spite of some real performance costs.
The fact the Toyota Camry, a classic grocery-getter,
starts with 17" wheels and can be had with 19s is the best evidence I can cite in my own defense! 19s on that car are just an odd fashion statement (if you want
style, a Camry, for all it's virtues, is not going to be my go-to...). Yes, bigger wheels have accompanied fancier trim packages for decades. but the absolute size has jumped noticeably since the 2000s, after being pretty stable for quite a while previously.
It's not all bad, of course. Bigger wheels with low-profile tires can sharpen steering response, may have more grip, and look great. But you can find many discussions in place like
Car and Driver and
Autocar, among others, about the costs of oversize wheels - more unsprung weight (sometimes up to double the base model wheels), extra road noise, poorer fuel economy (or reduced range on EVs), and most noticeably, harsh ride (and more expensive!). You'll see plenty of references to ride quality complaints in contemporary car reviews, with oversize wheels cited as the culprit. It's true that engineers have done wonders with active suspensions and careful tuning to make big wheels ride better than they have any right to, but all that could be avoided by just speccing slightly smaller wheels. Sometimes the difference is marginal. But sometimes it's quite noticeable, especially if you live somewhere with bad roads.
jimmy_uk also rightly points put that vehicles are now styled to look best with oversize wheels. It's the fashion. The performance (i.e. best compromise between grip/ride/NVH) sweet spot for the vast majority of compact to full-size vehicles (i.e. excluding subcompacts and city cars) is probably 15"-17" or maybe 18", anything bigger is really just a fashion choice for most road cars. And sure, put 20+ wheels on a Lambo, it's a
Lambo, nobody's going to criticize that. Though, of course, the McLaren F1 made do with 17s. Now you can get a Ford Escape with 19s!