It's similar to the "dropping cable" scenario... Yes, you can get what you want a la carte if you look in the right places, have the right apps installed, switch back and forth between them, make sure all your configs work properly and aren't buggy, "oh damn I'm blacked out for the game I wanted to watch", "oh the feed went out?", etc...
Or you can pay for cable and have a one-stop-spot for 100+ channels, including stuff you didn't even know you were interested in.
When you're paying $90/month for cable, the former is worth the added hassle for a lot of people (me included, I haven't had cable in 5+ years).
But when the service is $8/month? No worrying about cell service, no having to pause when on the phone, no having to switch apps, sports broadcasts, interface that tells you when your favorite song/artist is playing, dedicated stations that play live and historical concerts/events?
Yeah, at $8 a month that's a no-brainer for me.