MLB, I haven't tried for a few years but I could watch any out of market game on mlb.tv, but not any that involved the local team, so it was the opposite. For that there was a special regional sports channel that I'd have to subscribe to. No way to do it directly with the network, I'd have to get satellite or something.
That's the situation for probably 95% of viewers, though. Others might want to watch games from where they grew up, but most people typically follow the local teams. We don't even have a great way to get an antenna feed into our TV, and that also means we have one way to watch everything except local games, and another, worse way to watch them (for example, by not having a way to pause them).
I get why the streaming apps don't show local games from their business POV, but as a potential subscriber, that's a them-problem, not a me-problem. There's no way I'm paying that much money without being able to watch the home games.
If you're cool waiting a day to watch the games, nfl plus has everything with commercials cut.