regarding "hobbyists", there's a new book out
In the first full length analysis of the rise of left-wing hobbyists, performative radicals and the 'Identity Left', A Left for Itself interrogates...
www.johnhuntpublishing.com
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David Aaranovitch is a fan.
A friend has read it. She says its got a lot of rose-tinted view of the past about it (though the author doesn't seem that old).
Having only been alive so long I wonder how much things have really changed. Materially and structurally they have obviously, but other than that...