Interesting premise. I feeel one needs to define, or somehow be clear about what is meant by "relevant knowledge". Things like, how to use facebook, howto use x, how to use tic tok - relevant forthe younder generation, essential fort hem. Not relevant to many in older generations - any not essential. How to use a rolodex, how to write cursive, how to read a paper map, how to fold a paper map - not relevant for a youger generation. Does this mean not relevant at all any more? Hmm. And you do not touch on things like common sense (could go on for a long time on that one), how to balance a checkbook or checking account, how to change a tire, how to change the oil, (hmm, not relevant if you have AAA or rely on Uber only, or don't have a car). How to communicate face to face. That skill IS getting lost. I am VERY happy to hear your children talking with their grandparents sufficient to have intelligent meaningful conversations. I am also gussing that what is relevant changes family tofamily, group to group,location to location.
In general, I do not agree that the next generation will surpass their parents in relevant knowledge. Well -that of course depends on mydefinition of relevan tknowledge. Relevant to/for what/whom? Noting that relevant can be swayed in favor of one generation or another quite easily. More to talk about here for sure. Interesting food for thought here.