Boy I do hope you understand how those 10 hours in open world RPG and 10 hours in something like Space Marine 2 are not actually the same hours. You don’t waste up to 5 hours on Emil’s writing and needless traversal along with loading screens in Space Marine 2, you’re getting condensed cinematic action experience. You’re also don’t spend your time on inventory management, badly written dialogue trees, crafting and other BethRPG stuff.
Look, I can’t say that I hate Starfield, but this game has a tremendous talent of wasting your time on the most trivial actions possible like finding ammo or traversal.
So yeah, 10 hours for RPG content in general is small, in case of Bethesda games you can call this DLC almost tiny for the asking price.