William, thank you for your response. If you had read the first 28 pages of this thread you would know that we have tried every "solution" Apple and others have posted on the internet regarding GPS malfunction, none have worked. Yes, I (and I'm sure the many others with this issue) know that Wi-Fi helps with geolocation and must be on for GPS to function properly. This is not as simple as just turning Location Services or Wi-Fi on and off, if it was this thread would have ended months ago. Most of us have also contacted Apple Support and have gone through this with them, this is not a matter simply fixed in your iPhone's settings, at least not in a way that has been documented yet.
As far as your assessment that the vast majority of people are "not" having this issue, are you the official spokesperson of all iPhone 8/X owners? Are you an Apple employee with official statistics on this matter? Because the dozens (literally about 30 people) I have met and know are all having this issue with their new phones. However, since almost all that I've encountered live in nyc, they don't use their gps as often so they wont make a fuss about it or only noticed after I pointed out the issue. Do I think all iPhone 8/X's in existence have this issue? I have no idea, but every single iPhone 8/X I've encountered has shown this issue, so please don't patronize me or this thread by claiming something you have no facts to back up with.
Finally, the problem with MapMyRun is the same one being had by Apple Maps and other GPS heavy applications on these phones. And yes, I have called Apple and asked them "why their their application is not working properly with the latest Apple devices"...And that's why myself and others are here, because that has gotten us nowhere. Apple Support says they know of the issue but there is still no fix almost 4 months after initially purchasing and returning the 8, and now owning the X. I'm not here to bash or defend Apple for no reason, I'm not returning my phone, I'm just a consumer who wants his $1000+ device's GPS to work the way its supposed to. That can't be too much to ask, can it?