I mean, it really isn't. It's a massive headache for me at my day job (I work at a hardware design company); I am currently unable to get dev kits for a particular chip I need to develop for, which means I'm flying blind and unable to actually *test* my code until we get real hardware. (Which is honestly stressing me out.)
So far as I know, Square does not lease server capacity, they buy it. As do many MMOs. While virtualization can work fairly well for many things, MMO servers are not universally one of them -- especially not if the MMO server architecture isn't designed for it from the start. (Which I would lay good money FFXIV's server architecture is not.)
It's also worth noting that the average MMO server is not the same thing as a desktop computer; you're looking at more specialized server hardware, with particular performance metrics you must meet. If you don't meet those metrics, you end up with the game not performing -- pressing an action button on your hotbar takes half a second to register on the server, or the enemies 'stutter' around the field, etc.
Even for hosting companies that do have the hardware, Square-Enix can't just go lease the servers at some other facility, because you need the servers within a logical datacenter (like, say, Primal) to be in the same actual datacenter; MMO architectures generally have a lot of inter-machine traffic -- between the server that handles your inventory and character data, whatever world instance server you're on, the communication server that handles all the linkshell and channel traffic, etc. -- and you do not want that internal traffic subject to the speed limits (for lack of a better term) between physical datacenters, as opposed to being on the same local network.
The chip shortage doesn't make the login situation acceptable, it doesn't make it okay, but that shortage absolutely exists and it is a massive day-to-day problem for people in more than a few technical fields. And it's not something Square-Enix can simply solve by throwing money at it; they've demonstrably been willing to pay multiple times list price for the servers they need, but those just aren't available.
To be fair, they actually did halt sales of the digital copy of the game this past spring, so it's demonstrably something they're willing to do to alleviate pressure if they think it will help. The fact that they haven't done so suggests to me that their own internal numbers probably show that most of the folks who wanted to get in at Endwalker launch already bought copies, and that as a result removing it from sale wouldn't do much to alleviate the login issue.
That said, I don't know what they could actually announce. I cannot imagine they aren't looking into what options they have to alleviate the login problems, but if they just announce "we're looking into what options we have", people will say it's just empty words and they shouldn't say things until they have a fix planned. But if they don't announce that they're still looking into what further options they have, folks take silence as proof that they don't care.