Almost 30 years ago there was a project about making a computer which used FPGAs for all "software". It was called RAW.

Baring it all to software: Raw machines | IEEE Journals & Magazine | IEEE Xplore https://share.google/nI9GyFJu4HvbYFrBf

(If you Google the name you will find free PDFs as well, the IEEE page is more useful as a summary and such.)