All the navigation bluetooth GPS dvd etc nonsense will be hopelessly outdated and bundled in any $60 china headunit 2-3 years after an infotainment system's rollout... add a few hundred more, and you'll be getting features that haven't even been offered yet
True, aftermarket head units are very often better than OEM. But, we have SYNC3 in our new '18 and I am really starting to like it. You can't get that degree of integration with the vehicle settings/systems with an aftermarket unit. To each his own. . .
As to leather, you can buy better leather. Whether it's navigator seats, professionally installed premium reupholstery, or just a DIY reskin job with dirt cheap ebay surplus katzkin kits (probably wrong item shipped to installer returns...cuz there's so many steadily available at such ridiculous prices) --- all depends on enthusiasm, aptitude, or willingness to pay... however it's pretty much ALL better than any factory option.
See the F150 forums, those guys swear by the stuff, and even the sillier color options are damn gorgeous materials, fit, and finish:
https://www.f150forum.com/f118/lets-see-your-katzkin-leather-seats-380605/index11/
On this, we totally agree. Even in Limited models the leather isn't that great at all. In fact, the perforated material likely is synthetic and not real finished leather. Most of the 1st and 2nd row seat surfaces are actually matching vinyl, with very little real leather. The 3rd row is entirely vinyl.
The Platinum has "premium" leather and I can say, having experienced this, it is thicker and more supple than other seats. It feels more comfortable, at least to me, and I can really tell the difference. But, the added "Agate" grey stripe along the outside edge of the seat bottom causes it to wear prematurely. I've seen a couple trucks now with that edge heavily worn on the driver's side and a couple of them had only a few thousand miles on them. The Navigator uses the same premium leather, but the seat pattern is different and it should wear better IMO.
The Limited I just purchased has most everything a Platinum except the heated steering wheel- I can live without that!
Unfortunately, you can't get a heated steering wheel on a '15-'17 Expedition. Even though it may be mentioned in some printings of the owner's manual, it was never an option. It became available for the very first time on 2018 models.
This is one add-on that's quite challenging to install after the fact. It's been done on the F150 forums, and it may be possible in an Expedition, but it sure won't be easy and I have yet to see anyone actually get it done in one of our trucks.