I think I almost have an entirely complete answer here, but am still missing three of the main puzzle anagrams (see entries in italics below)...
Your friend has stopped using his computer because he has learned about:
His 17 bullet points...
The young man approached the train station, he had been out on the slopes by himself this morning, but only for a ...
The name of the new type of puzzle you created is:
Equation in OP for reference:
Same + Proportion + Close - Taste + Me - Track = ___
Put it all together:
Leaving my initial post for better context on the comments below the solution:
[Posted 2021-08-24 06:31:07Z]
Not a full solution, just some ideas.
I feel ...