I'm not sure about the specific issue you're facing. For me, attachments show up as these rounded rectangles and images in the signature don't. I'm currently on mobile, so I'm not sure about the web UI. Can you post a screenshot?
I'm not saying that should change everything ... but in 20 years the only thing different is now there's more integrations with other products but gmail is still the same.
Happens fairly frequently on Gmail. That email will show up as has:attachment
I know how to touch type.
Most of my email responses are pretty generic, I'm not writing any haikus. Should I be?
They already have excuses for that, but this one justifies a bit more.
My cynical take is that they have 2 billion users and aren't really interested in making significant changes to existing functionality.
When I was at Google, I really wanted fixed-width text (I managed to add this with a user style) and tree threading.
I don't think I've ever confused an attachment with an image anyways, but there at least seems to be a standardized way to differentiate them.
Google employees do use an internal version of gmail. (I don't work at Google though)
It has been years since I logged into gmail, and the only reason I did was to re-enable IMAP which they disabled on their own for some reason.