At the very least, I can't see mods wanting to have a front-end that hides things in ways that they can't turn off.
Otherwise, people on the blocklist would become effectively immune to moderators using the front-end, because they'd be completely hidden.
Basically, every time you visit the page, it has code that sends 500 * 4 queries to one particular instance, making it load a page from the modlog, do a search, etc.
So everyone visiting the page would suddenly be sending 2000 queries each, and in theory, enough users would DoS the server by overloading it with those requests, rendering it unusable.