I still remember how handy I found my first generic mountain bike when I bought it in 1989 or so, after decades of riding around on bikes with firstly 27" then 700C wheels. The difference between those and the 26" wheels isn't much on paper but the feel and ease of use is huge. I'm pretty short, so they suited me well. I sold my last 26" wheeled mountain bike in 2020 when I bought a recumbent, though had a couple of 700C bikes for a while. The last one of those is up for sale, as I just don't use it now.
Having been used to recumbents with various sizes of smallish wheels in the interim, riding my 700C wheeled bike recently to check it out before putting it up for sale was very strange. Even after I'd got used to it again, I couldn't imagine having a mountain bike with such wheels. If ever I were to contemplate buying a mountain bike in the future, I'd be looking out for something with 26" wheels. The theoretical rolling ability of a 29er might be a selling point for some, but a 26 incher is much more useful. When you need a 15" frame, the larger size of wheel is rather disproportionate.