Not necessarily. The only reason Harry got a tour of his loved ones is because he backed Uriel into a corner (as much as he could) and demanded it. Before that, Uriel was already pushing him to go ahead and make a decision.
Uriel could still have said no, to this, but being a 'good guy' decided that it didn't hurt anything. But, if Lash/Lasciel, did need more balancing, this could have been part of that as well.
There's nothing in the text or in a WOJ that I can personally bring to mind that tells us Uriel has, is, or ever will act with Harry's best interests at heart. Harry is one human being; a rather important one, true, but still only one guy.
I expect that Uriel will act with Harry's best interest at heart, when it serves his plan(s). Soulfire for instance, yes that helps Harry, but when the long game plays out, I bet it helps Uriel more.
Uriel's tasks and responsibilities extend to....Well, basically everywhere, as an archangel. So Heaven's Spook wouldn't have any particular reason to feel compelled to tell Harry anything just because.
None of the 'major players', read that as Sidhe Queens, Jim, Angels, Fallen, Jim, Odin, Senior Council, did I mention Jim?, give any knowledge away for free. Knowledge is power, the more Harry has, the more powerful he becomes.
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The only Fallen that we know to operate as a shadow is Anduriel, and I could see him and Nicodemus wanting to get Harry out of the picture.
Yes Lasciel's story isn't done per WoJ. My bet is that Lash was the 'Inez construct' that was seen in Graceland, and that we haven't seen Lasciels nicklehead yet.