I've seen a lot of people claim this. But it reminds me of what was said about the Falcon Heavy before its development got underway. That rocket turned out to be much more challenging than expected, despite being "just" an iteration on Falcon 9.[1]

That said, I watch progress on Starship with interest and optimism.

[1]https://www.defensedaily.com/developing-falcon-heavy-rocket-...

It's the easier one to design -- but actually building it requires a production line that cranks out one of the most complicated rocket engines ever designed for cheap (it'll need over thirty engines in final configuration, though the first launch may be with "just" 20 or so).

Easy and rocket engineering don't really go together. I imagine it will still be a challenge.