Lending or selling ebooks necessarily requires DRM. A large part of the community thinks having DRM is way worse than not being able to lend or sell.
As an example: Kobo will tell you, at the bottom of each book's page, if it has DRM or not. And it will happily sell you a book without DRM and let you download it.
Some publishers require DRM. Which is entirely different than the false claim made earlier that "selling ebooks necessarily requires DRM".
My comment was mostly about the “steam for books” being lauded better as physical books. To me it would only be strictly better if you could sell and lend (which you can’t on steam)