I can see why companies are hiding schematics. Until early 90s for almost every product you could get schematics, calibration procedures, all the tech drawings and most parts (but you could still get e.g. preprogrammed PAL or CPLD chips from the manufacturer). This all changed when Chinese companies started copying everything that sells. Current situation is a by product of that, state inaction and corporate greed. We should really look at relationship with China and start proper sanctions before opening up. I support right to repair, but it will only let Chinese companies steal designs much easier.