The cheap 2000D has both wifi and gps in it, however a top of the line professional 1DX Mark II doesn't. In the age where even my toaster has wifi capability that communicates with my phone to make toast for me when I wake up, why do some high end professional cameras not have this feature?
The simple answer is a difference in needs and reliability. Consumer cameras pack in a lot of features for the price, but they are jack of all trades devices that are not designed as ruggedly or dependably as professional gear and lack the same depth of functionality.
On the professional side, modularity is the name of the game. Professional cameras have a great deal more core functionality but don't have as much outside the core to keep the product as cheap and light weight and dependable as possible, they do not include much functionality outside the core and instead offer modular addons to provide more rigorous functionality to those professionals that need it.
Professional cameras don't generally include wifi, they don't generally include wireless flash sync, they don't generally include a built in flash, but they support add on modules that can provide all of this functionality.
As a professional photographer that mostly does events, wi-fi is not useful to me and I have no need to have the hardware built in and possibly making my camera heavier or less reliable due to the added complexity. I have a high end on-camera flash that can control my wireless off camera flashes as well because that's the functionality I need for what I'm doing.
If I was in a studio instead, I'd forgo the on camera flash for just a pure remote flash trigger that works with whatever studio strobes I was using and I'd add a wireless sync module to automatically transfer photos in to my studio management software as I shot.
Neither of these scenarios can be covered as well by the limited consumer functionality built in to something like the 2000D. The cost of the dependable hardware in these modules would have added another $1000 or more to the cost of my camera plus more weight and bulk that I don't need. Having them as modular units lets me tailor my camera to the situation I'm shooting and not have to deal with stuff I don't need. This becomes even more prevalent in the medium/large format and video worlds where the cameras you buy don't even work out of the box without putting multiple interchangeable pieces together to rig a camera the way you want it to be.
According to these specs, the 1DX Mark II has a built-in GPS.
This said, the 1DX targets professionals who may not have the same requirements as other photographers. For instance the 1Dx has no built-in flash.
Most pros dont take pics to instantly share on insta. They post process their images. They retain copyright to their isges snd charge for an image bigger than a thumbnail or a screen sized un watermarked image. People taking pictures with their fridges & toasters usually are taking fun snapshots they just want to show n share. Different user has different needs. Controls vs scene modes.