Apple's support forum, MacRumors forums, and Reddit, show that the problem appears to be widespread across the country and not limited to any specific carrier.
This is slightly annoying given that the iPhone XS is supposed to have significantly faster data speeds on Wi-Fi and LTE compared to the iPhone X, according to data tests conducted by SpeedSmart.
There's even a new antenna line running along the bottom of the phone as discovered by a recent iFixit teardown, which should have helped with reception.
Additionally, folks at r/Apple, the most popular subreddit for iPhone and other Apple related discussions on the site, have corroborated the claims.
Of course it could be nothing to do with the fact that Apple abandoned Qualcomm's more advanced broadband modem in favour of a much cheaper deal with Intel. After all, how could Intel fudge the SpeedSmart reception test?