I'm not sure I understood your point correctly. I interpreted what you said as meaning that Starship being 10x better than the Shuttle would be a significant improvement.

I'm saying that the Falcon Heavy has already achieved a 35x improvement from the Space Shuttle, and therefore if Starship achieved only a 10x improvement relative to the Shuttle it would actually be worse than what we already have and so wouldn't be an advancement.

If you meant 10x relative to current rockets, then yes, I agree that would be significant.