If you watch the video, it doesn't only concern the size of the planets, but the distance between planets themselves. They mention the example of the distance between Earth and Pluto being 1:100 scale.
Only thing is that's not even a guarantee with SC clearly having trouble moving to double bit precision. 1:100 is the most they can hope for in terms of scale.
And I feel like for some, yes, it's just another bullet point. But for others like me, it just says a lot about what Frontier has already accomplished this early on.
In practice in E

I'm not sure that you can even reach other planets while you're in normal speed. I recall one of the dev design dicussions was talking about supercruise and how it'd be a much harder to task to allow free supercruise. I think they solved it via this two-step system, reducing the size of the supercruise system, allowing for lower precision (less steps in a smaller system), and dropping into an instanced 'real scale' space.
Anyway... whatever the case is, the simple point I was trying to make is that gameplay design should trump all other factors. If to scale simulation holds back design (and it does when you simply can't generate enough variability), it shouldn't be an issue.
I personally quite like the E
