Correct. Not much you can do to keep it from becoming Old Cracked Leather. Remove UV and weather exposure. Thats it. Soap and water to clean. Clean up spills.
Do your realize that top layer is pretty much vinyl? Paint layer on top of leather has UV protection, etc. None of those "products" will event penetrate it. It is in a sense like vinyl.
Quality leather will last longer. Let's say you got same quality leather as it was from factory. It will look great 10 years. It will be like what you have in 20 years. I think it's pretty good. If you do keep it in shade - it will last even longer.
P.S. Modern vinyl's will outlast any leather. But they are not cheap. So its kind of weird feeling, pay more for vinyl
I bought the Full grain leather. I did query about MB-Tex but they won't do it, and if they would, it would be cost prohibitive. That would solve the problem. If I had your skills I would do MB-Tex.