I purchased a 2021 XLT in March 2021. Currently, we have driven approximately 3,700 miles. So far, the 10 speed transmission has been flawless. I installed the JLT catch can at about 2,500 miles. Wife took it on a long trip after the install, I just checked the catch can and it had about 1/4" of oil in it. Having the catch can gives me piece of mind since it obviously has some oil coming through the PVC system. I have a catch can on my F150 (also with the 10 speed, no problems) and V-8 Mustang and they both catch quite a bit of oil. My daughter has a V-6 Mustang and her catch can gathers a lot of oil.
So far, we love the Explorer. As with all newer vehicles, it has too many bells & whistles, so lots of things to give problems down the road. However, all new vehicles have all this "stuff". My best friend bought a new Malibu for his granddaughter and it does all kinds of weird things and gives lots of messages (and won't start sometimes). It has lived at the Chevy dealership with no solutions yet.