@jwilliams5854 After digging through existing Knowledge Base articles and blog posts to find any information on this update/change directly from Hubspot, I found…pretty much nothing.
So, I created a new Idea that encapsulates this Idea / feature request as well as others that I have come across in my search for info on phone number validation and auto-formatting. You can find it here.
Knowing that Hubspot only makes feature requests when a sufficient number of users request it, I would recommend upvoting and commenting as many of these ideas and posts as possible. The ones I found are here, here, here, and here.