Tsundoku – Phenomenon of acquiring reading materials but letting them pile up
en.wikipedia.org
en.wikipedia.org
In essence I see this as the equivalent of "backlog" in most cases, i.e. (my backlog) is piling up. And is otherwise a fairly straight forward concept to convey in English. Hardly "untranslatable", and seems rather silly to import a word that's more or less a pun that would be lost upon all of the people using it.
One thing the English wikipedia doesn't mention is that 積んでおく (tsundeoku) has a contraction/slang form 積んどく (tsundoku) which I think solidifies the play on words to create 積読.
“What’s it called if you actually read the reading materials you’ve acquired?”
And then I realised the answer would simply be “Reading”.
Things like Pocket are enablers of this bad habit, though the blame still ultimately lies with me and my moral deficiencies.
I do it with physical books too, but to a lesser extent.