It's not, to me.
My bookmark list is huge and basically acts as (part of) a knowledge base. Conversely, open tabs are something of a hybrid between a "read this later" and to-do list.
I'm sure there are many other styles of organizing tasks/knowledge, and I would be a bit careful about discrediting what apparently works for other people.
There's borderline cases of working against UI paradigms like using the trash as a folder to store important documents, but I'd argue that this one isn't one of them.