TBH I'm not sure it's being lost per se. What concerns me is the need to pointlessly & continually reinvent the wheel!
Let's be clear here. This is NOT the fault of current generations. I am NOT having any form of pop at them.
The root cause of this issue is MY generations fault, the current 60 yr olds. For reasons beyond my miniscule brain, we deemed it fit and proper to NOT teach those who come after us about the relevance of what went before. For some bl00dy stupid, idiotic, probably politically correct, reason we thought they did not 'need' to know about such things. Perhaps we got carried away with the visions of flying cars in the year 2000 portrayed by 'Tomorrow's World' (google it if under 40)? If so, we should have stopped the weed and acid and grown up, gotten real.
The simply indisputable fact is that knowledge & wisdom is based on accumulation. One needs to understand what went before, what happened previously, to build upon it. This is why, IMHO, the current batch of 'smart' controls do worse (performance wise) than the 1990 controller I have running my system at home. The guys who designed the Tado I link to had to literally to reinvent controls concepts I was using in the mid 1970s simply because they didn't know they existed.
Had they have done, had OUR generation bucked its bl00dy ideas up, they could have shaved 3-4 years off system development!
Us old gits need shooting - not the yoof
Rant off