My son applied the CWRU, Lehigh, RPI and WPI (and got in to all four, ended up at WPI). I did the tours with him and I think they all have very different vibes, so I think you are right to wonder if maybe they just weren’t attending to that. (Or heck, maybe your son felt he could be happy at all of them so it didn’t matter.)
This is parsing hairs here, because all four are great schools with strong programs. But when my guy was writing out his pro/con list after the acceptances came in, sometimes it came down to the smallest thing or the weirdest gut instinct.
Our take was that Lehigh felt the most like a school-spirit-y, not just a STEM school. It was the most social feeling, by far, but also had really great engineering programs so it felt like you were giving up nothing else. This was my son’s first choice, but he didn’t get any merit aid (check the common data set, you will see they don’t give out very much to very many people) and at that full-pay price point, it wasn’t feasible for us. (Also, since we had to wait until April to find out if he’d gotten in, the other schools, where he got in EA, had all really grown on him in the interim - he’d had time to imagine himself at those schools and get excited. When we got zero merit aid from Lehigh, even after attempting to appeal and showing them what he got at CWRU, RPI and WPI, it was over even though this had been his long time favorite.)
To us, CWRU felt like the place where the kids were the most serious, or take themselves the most seriously. We really liked the things that Cleveland could offer and that gave the campus a really positive feeling of potential (as opposed to the other three, which are adjacent to towns/cities that either had their heydays many years ago and are working to revitalize or that are just less fun feeling).
RPI - my kid really didn’t like Troy. It had nothing to do with the students or the program, he just felt like the environs outside of the school were dreary and that he’d be less happy.
WPI - this is where my guy ended up, so obviously he liked it.
Seriously though, we liked that the campus felt like a campus, the students seemed generally happy with the school and their programs and like they were having fun with each other and activities outside of class. But it just clicked different and better for him.
Of course, all of this is totally subjective and personal, and the best thing for one person is clearly not the best for another. Because the schools were just coming out of pandemic freezes on visits, the earliest we could visit was right before senior year of HS started - we went the last week of August so the schools were in session, but barely (or it was orientation time still) so it’s also highly possible that what we saw wasn’t a realistic portrayal either. All that to say - if he ends up really serious about any of these and can’t decide, another visit might be a good idea. Good luck!