From plan to production is not 7 years, just the building itself. Especially not now that cooling capabilities are disappearing (many of those French installations had to reduce output significantly due to the heat wave this year.) This will mean it will cost much longer to get these installations okayed and their usefulness is further limited.
Calling me an ecofacist also means this is the end of the line of this “discusssion”. Have fun in your alternate reality.
To summarise: use a terminal server system if you can, using a desktop for the end user that can be made to behave like windows (or another concept that works for your demography), and have the whole setup in a NixOS configuration that you manage in git.
I see that https://github.com/ltsp/ltsp is still going strong.