Isn’t that one of the cornerstones of the Mechwarrior universe, that thousands(?) of years in the future, there is a guild(?) that handles all the higher-level

Isn’t that one of the cornerstones of the Mechwarrior universe, that thousands(?) of years in the future, there is a guild(?) that handles all the higher-level technology, but the actual knowledge has been long forgotten, and so they approach it in a quasi-religious way with chanting over cobbled-together systems or something like that? (Purely from memory from reading some Mechwarrior books about 30 years ago)