It would be interesting to know the average Roam user profile - I suspect that most don't need multiple simultaneous HD streams or the ability to transfer massive files quickly. I suspect many are RVers or people who just want to check email, make a video call that doesn't need to be high-res, and maybe browse social media.
But point taken that many users will want an upgrade option
Lots of people working on the road say the upload speeds are already problematic for them in certain areas, as the usual mobile plans are deprioritized.