I have two shelves filled with handouts and notes from the days I was studying engineering: one year of college prep school in Lyon, one year of computer sciences in Bordeaux, two years of Telecom engineering in Lyon, and one year of IT business, IT systems, and data science in Stockholm, all of which I will probably never read again.
It's enough content to run several blogs for years, but finding time to go through, research, and curate each page is a Herculean task. Not to mention the things I'd rather erase from my memory, like the endless mathematical demonstrations or the obsolete knowledge that will never be of any use.
About 10% of my courses are worth reading again if I consider my current position. Encyclopedian knowledge has its value, but I'm not fond of it. It helped me become who I am now, but I sometimes wonder if a return-on-investment of 10% for 5 years of college isn't overpriced.
I met great people, traveled to many places, and experienced things I wouldn't have otherwise. That, I can't deny. Time is relative, and so is the value we give it.
One way to make it all worthwhile is to write something about it, to help others make more informed decisions.