This is the 3d car I have owned with the light gray interior and leather. Yes, it can and will get dirty, but I learned the hard way to use only mild soap and minimal water on a damp cloth followed by a couple of dry ones to keep both that carpet and leather clean and supple.
Of course, if one gets grease on the carpet, only a solvent, sparingly used, will get that off. Hopefully none will ever get on the leather. If you do use solvent of any kind, be very, very careful. Don't rub the finish, just daub the mess off, and follow it with the water/soap treatment to stop any solvent action.
Why do I keep buying these light colors? Simply because I like a light-colored interior on a car; it makes it lighter, cooler, and easier to live with, in my mind. Particularly with this car's relatively small windows, it helps remove the "tunnel" feeling.
The horrible example which taught me my lesson about these light interiors was actually removing the finish off the Benz seats which I had at the time. Almost did the same thing on my '94 LHS until I realized what these commercial "cleaners" were doing. Hopefully, some of these newer dyes might last longer so long as they aren't gouged or solvented off.
In my experience, these dyes for leather are not very permanent, so you want to do very minimal rubbing with anything other than a lightly damp cloth. And yes, seating yourself with minimal rubbing of the seats will help. The gliding seats are a godsend in that case.
BTW, this leather can be rehabbed by redying, but, although it looks good for a bit, it never lasts very long. Any color other than natural WILL wear again particularly where redyed and wear off again.
As far as the carpeting is concerned, on those same cars, my trusty cheap transparent vinyl mats did well. I would like to see some kind of dead pedal protector cover of vinyl or so. And I'd buy and install that on this one since it is so very difficult to cover the dead pedal otherwise.
The more care you give to the problem, the less time you waste on cleaning it.