USA is a big place, with a lot of wilderness. Sweden is the size of one of our mountain ranges. A lot of people spend a lot of time in that wilderness, but I suspect the issue is one of syntax. The term "backpacking" has taken on more of that spirit of the term "hiking" that you're referring to. You can still say you went on a multi-day hike out around some 14,000ft peak; but if you just say you're going hiking it could mean a lot of things, but if you're backpacking it assumes you're out camping for some of it.
Also some of those "influencers" (noting social media doesn't reflect reality) probably live in areas of the country where they have vast wilderness a very short drive away. A short day hike is worth it if you live in Colorado and can get to the trailhead in way under 2 hours. It's not worth it if you live in Boston and need 8 hours to get to anything _somewhat_ remote.
Also some of those "influencers" (noting social media doesn't reflect reality) probably live in areas of the country where they have vast wilderness a very short drive away. A short day hike is worth it if you live in Colorado and can get to the trailhead in way under 2 hours. It's not worth it if you live in Boston and need 8 hours to get to anything _somewhat_ remote.