This also means that you need to know the processor your motherboard supports (or, easier, probably RAM) before putting in an order to upgrade the processor. (These processors are incredibly cheap, less than $10 for something that might have cost literally thousands ten years ago, so worthwhile to spend a few minutes and pick out your favorite based on cores, watts, Ghz, etc.)
(Another commenter says that there are some motherboards that accept v3/v4 but also can run slower DDR3 RAM. That's new to me and quite cool - DDR3 is extremely cheap, even now. I did find these motherboards on aliexpress, too: https://www.aliexpress.us/w/wholesale-XD3-motherboard.html?s... and one clearly says v3/v4 cpu's with DDR3 RAM. That could be very useful although memory speeds are slower since CPU performance can be boosted with v3/v4.)
Touche.. actually a good point, but actually those are two different situations.
With one, I'm accessing a website and trusting that the certificate is signed by someone I trust; so the trust in my browser certificates (which include certificates from hundreds of certificate authorities all over the world, any one of which could be compromised, robbed, or controlled by an adversarial person or even government) is extended to the site that I'm visiting. To say this is weak sauce rather understates how bad this actually is. (To paraphrase Churchill, this is the worst possible design, except for all the rest.)
With the other, I'm logging into a server for the first time (and I could simply deploy the same trusted host key to all my ssh servers via an autoscaling configuration or whatever). I think it's debatable if TOFU is worse or better than your (granted clever) metaphor.
(to those who'd recommend userify, yes - great for the client login issue and definitely increases security, but to parent's point, TOFU is still needed unless you want to distribute host pubkeys)