In all the usual connector standards there's also support for a
communication protocol with which you can basically remote control the screen via the connector, if both signal source and screen support it. A surprising amount of screen these days do support it (probably because it's just the same IP block copy/pasted between controller designs) it's just somehow rarely used. In some screens you have to toggle it on via the OSD. So if ever that day comes where screens have no buttons, you can probably just turn it on/off/adjust brightness/set signal source etc. via the computer, which frankly, isn't too bad. (and also allows e.g. scripting) I even used to have such a screen with no controls, a 19" 1280x1024 Samsung LCD from 2008, so that tech isn't exactly new either. (but let me tell you it was a PITA with 2008 Linux; iirc the standards are from the 90s)
I also honestly never had an LCD break these days. Especially since LED backlights these things don't really have a lot that can break anymore, except the power supply which is usually repairable. There's quite a few screens these days that have external power supplies, so getting a new one would just be a matter of buying a new power supply. Older LCDs where all the processing was chopped up between 7 different custom ICs (which all got amazingly hot) and CCFL backlights which just die eventually, (and their often considerably more complex power infrastructure) yes, their days are limited.
I really dislike capacitance touch buttons, but usually "business" versions of screens still have proper, pressable buttons and often even a power switch that physically cuts the power. (and also come in colors other than "black") Yes, another premium price tag on something that should be standard but what you're gonna do.
Liquid cooling these days is IMO a complete waste of money, if it ever wasn't that is. Invest into good PWM fans and buy a case/heatsinks where the fans can be physically as big as possible (the bigger the fan, the less RPM to move the same amount of air - simple physics) and you probably have to press your ear to the case to even hear the fans in normal operation.