When the video requires a wide view, yeah that makes sense. But only when required. Shouldn’t be the default since holding the phone that way isn’t the default. Simply makes sense.
I’m in my 40s. I’ve had phones since the 90s. Only sideways by default ones I recall are some Moto and Sidekick or similar. And they weren’t really close to today’s video capability.
What phone are you referring to that is sideways by default??