IMO securing Presidential communications is of paramount importance to national security. Even the non-classified stuff. But there's little reward or glory for doing that. It's really a "small" task.

Compare to spending billions of dollars building gigantic data centers, tapping fiber everywhere possible, recording every scrap of communication metadata that exists, actively subverting computers, doing quid pro quo spying on our allies domestic communications in exchange for them doing the same to us. Etc. Etc. Etc.

The grandiose profligacy is unending. That's how bureaucrats get promoted and get job satisfaction.

Actual "National Security" for the President, well, that's obviously beneath them.