By all means, point to some official statement showing that Google cannot market the Pixel phone as supporting the 4g/5g standards due to Google's use of Samsung modems.
You are saying Qualcomm doesn't have competition because Qualcomm make the best modem and others making worst product cant compete?
The Exynos chipset is cursed, Samsung only ships it in markets where performance is a lower priority than price, hence not shipping Exynos in the US outside the Google Pixel whitelabel relationship.
I thought it was primarily because of some patent/royalty dispute with Qualcomm?
And/or it not having support for CDMA which was not relevant outside of the US. Now that it’s not an issue I wouldn’t be surprised if Samsung would transition to Exynos eventually (they are already apparently selling some models).