They don’t need it logged in 24/7, they only need it logged in while they’re undocked in a capital. As you rightly say, blops are generally going to be just fine warping to the citadel.
Make no mistake, anyone hunting capitals will park a cepter on the beacon. If the citadel doesn’t have a gunner (which most of them don’t until you rage ping for a permitted gunner to log in) it won’t push you off the grid.
They’ll park a point, wait for you to jump to the beacon, and kill you right on your own citadel grid.
The argument that it’s deep inside your own space means that you’ve got a large alliance, and there’s more than enough people in your standing fleet to light a cyno for an e-jump. Should be standard practice for every alliance that doesn’t suck.
The only people that these will help are as you say the people that won’t have a player-lit cyno. And those ones won’t have the help they need to get rescued when they get pointed 200km away from their citadel.