Definitely agree that they aren't as much of a status symbol.
Regarding your point about students getting the X and business folks getting the older style ... I think this makes sense. If you're buying it for yourself, you're more likely to splurge. Unless you're the business owner, there's very little use cases where your employees "need" an iPhone X. Get them an 8 and they'll be happy using a free phone.
Regarding the notion that you saw way more iPhone 6's back in the day, that also makes sense. In the first year, they probably sold way more 6/6+ than they did the X-design. That year, they sold 230,000,000 phones, where probably 70% were 6/6+. That's 161 million 6-design phones. The worldwide user base was much smaller then too, let's say 3 billion (total guess). That would lead to 5.4% of all users. Almost 3x as many as the X-design.