Sorry to say, but it’s intentional!
From the notes of the 7th Winds of Magic Beta patch, which have since been archived. This should’ve been included in the notes for the 2.0 patch, but must’ve slipped the net - we’ll work that out.
It’s my bad 
, the merging of the beta notes collection in to the master list of final changes was inevitably going to have a note or two go missing - for that I do apologise. I’m quite annoyed at myself it was quite an important change.
I don’t recall that being mentioned as a reason, and searching doesn’t seem to confirm a designer mentioning that.
There was no official explanation ever provided for the Shade nerfs, so you are correct.
As for OP, there had been places here and there where people complained about the Shade active’s duration. One of the major complaints was indeed in regards to weaves, but there were also complaints about its use elsewhere. I don’t think anyone overwhelmingly wanted it one way or another(on this forum).
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