I would ask you something, instead I'll pin this answer (as I pinned those from the guys insulting me when I explained there where never be a long range wireless charging, but just another Qi).
Ryzen Macs are coming dude, forget ARM Macs this it's just a poor interpretation of Bloomberg article that just said "Apple to manufacture it's own CPU in 2020", tey never named this Apple-manufactured CPU to be ARM (migrate macOS to ARM besides complicated iits too expensive and leaves Apple constrained to few CPU options), FYI sir AMD license ZEN IP as ARM holdings license ARM v8, a semi-custom CPU tailored for Apple (including whichever IP Apple wants to improve or enforce propriety) is among the options, and what a coincidence, AMD manufactures Ryzen with same glofo 7nm process used by Apple across Axx and Txx CPUs...
Whike I would love an Threadripper tc xMac, rumous points just to iMac and Mac mini as first Zen Macs , and if you have a chance to watch the Pro Display HDR you'll see how many vents holes insanely not needed it has, this is because is the new form factor, the next iMac need to have those backs with lots of holes to provide enough cooling exhaust for higher TDP (and old Mac point of criticism was cooling until the ncg Mac pro)
Maybe Jony Ive won't be happy with the new iMac s, because likely will be thicker and exposed, but no user will complain again about performance being thermal throttled.