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The Distribution of Users’ Computer Skills: Worse Than You Think (2016)
(www.nngroup.com)
This is a most excellent place for technology news and articles.
That is the reason for degrading proficiency. Not, that the tools are bad but the attitude, they have to be easy to use.
That almost everything "just works" is nice as a consumer but it won't make you troubleshoot and you will not gain technical expertise by using such devices.
If I'm buying a bus ticket, i shouldn't have to troubleshoot imo