Exactly. Computers having infinite capacity is sometimes harmful. One of the things I like best about kanban approaches, especially with physical cards is that they discourage putting in too much. When I look back on previous boards (e.g., [1]), my main thought is we still had too much room. We wrote up and carried along so many cards we never got to. But even so, that's way better than something like Jira, because the limited board meant limited opportunity to distract ourselves with meta-work.

[1] https://williampietri.com/writing/2015/the-big-board/