I'm not talking about the names of packages, but the actual channels in them. Directv Now is missing some channels that are available on Directv, and there are some bigger things like NFLST, MLBEI etc. that are not available on Directv Now. They can't try to pass it off as a substitute if it doesn't have the same lineup, same locals, same 'extras' like NFLST, international channels and so forth.
OK, but I explained in detail any potential small differences that I believe *may* exist in the same-named packages on AT&T TV vs. on DTV sat.
Beyond that, international channel packages are already available on DTV Now, so I'm sure they'll just transfer over to AT&T TV. I expect that special sports packages like MLBEI to be there too (at least for in-home viewing, with the available team based on your billing and IP/geolocation addresses). NFLST is a special thing and who knows how that's all going to shake out, other than to say that it will exist on at least DTV sat this coming season. (Note that AT&T Uverse TV has never had access to NFLST but that didn't mean it wasn't seen by AT&T or consumers as a direct substitute for DTV.)
As for basic cable channels that aren't currently included in either Plus or Max, I believe that they'll either get added to one of both packages by the time that AT&T TV launches or they'll be available within add-on "Extra" packs. I definitely expect channels from A+E Networks and AMC Networks to get plugged into Plus and Max.
As for all those popular channels in the Discovery family (including HGTV, Food, TLC, ID, etc.), I'm not sure at this point whether they'll get put into Plus and Max or simply be offered in their own separate "Discovery Extra" pack for $5-8. Why do I think that's a possibility?
From 2018:
Discovery may launch its own streaming service, too – TechCrunch
From 2019:
BBC and Discovery team up on a new streaming service focused on factual programming – TechCrunch
Given that, like me, you couldn't come up with any plausible alternative explanation for the appearance of Plus and Max on DTV sat, I take it that you agree with my prediction that those packages will become the new default options for new DTV customers. Those old packages (Entertainment, Xtra, etc.) are living on borrowed time.
Even then I'm highly skeptical that they are going to tell people "you can't have satellite because you have AT&T fiber". Are they going to force people to subscribe to AT&T for internet to get TV from AT&T? I think they'll let them have what they want, though they might incent them to choose internet by making it cheaper (no $15/month advanced receiver fee, maybe no contract or at least not a 24 month contract) or making them pay for the satellite install up front.
You could be right that they'll simply incentivize customers to opt for AT&T TV because it's cheaper. But I tend to think that satellite TV won't even be presented as an option among the "services available at your address" on ATT.com if that address qualifies for AT&T Internet or Fiber. (And if it qualifies for either of those services, my guess is that there's a better than 90% chance that it's also served by at least one other broadband provider, such as cable.) I imagine, though, that if someone calls up and insists on DTV satellite installation at that address, they'll sell it to him/her.