Is using doomemacs future proof?

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Doom Emacs is a configuration of GNU Emacs, which has been around for almost 40 years. Given the popularity of Doom Emacs, there will always be people willing to distribute and improve the code. Even if Emacs would suddenly vanish, all your files are in plain text so you can easily move to another system. There is no lock-in, no contracts, no licenses, just freedom to do as you please.

Thanks, seems reasonable! We will see how the user-base size changes with time!

The more users, the more longevity. Free software is controlled by users, not by some corporate egghead who curtails your freedom.