I'm not even sure this is true anymore.
A Roku remote has a million less buttons than any cable/satellite remote. Couldn't be easier to figure out. You want to watch the NASCAR race? Pick whatever service it's on, and chances are, it'll be right there on top once the app loads. No need to scroll through the cable/satellite guide or search for it if you don't know the channel.
I never have to log into my various streaming apps after the initial logins when I first signed up. The Roku interface is simple and extremely easy to navigate for anyone of any age with virtually no learning curve. Wanna switch to a different streaming service? Home button, arrow down/over, hit OK. New app loads. Not as quick as simply changing the channel, but definitely just as easy. I can get from YoutubeTV to Prime with a few clicks and a matter of seconds, and the NASCAR race is always front and center. Just hit OK and watch.
My only gripe is that the individual apps (YTTV, Netflix, Hulu, ESPN, MAX, Paramount, FloRacing, etc) all vary in quality, with slight differences between how they operate. That, to me, is the only reason why I would recommend cable/satellite. But between all my streaming subscriptions, I'm still paying less than I was paying for cable 10 years ago, with more stuff to watch. That's a clear win IMO