But perhaps thats the point? As in, the shards are supposed to have little use if you're not using that element. Non-time SoR isn't that good, but lets take a look at the others post-patch and compare.
Shard of Patience: Sure, you can make the scorp argument, but other than that this is going to be almost strictly with water decks. And so far I'm not seeing the scorp deck that'd be better with this than Dune-momentum or dark eclipse-venom scorp.
Shard of Divinity: 16 max hp and 16 hp, not going to help all that much. But +24 max hp / hp for a miracle stall? This can actually be useful. I don't see it outside light though.
Shard of Gratitude: Now inferior in every respect to sanctuary outside of Life. Rainbows now want sanc for the +1 hp and hand protection. But even life has feral bonds, so its niche is reserved for Fire Stall Life edition. Any deck that needs healing that bad can splash an easier heal method usually.
Shard of Void: Considering it doesn't deal damage, its a real niche card to utilize in the first place, and as its niche, if you're using it its a core part of the strategy. And if its a core part of the strategy... there's no reason to not Dark Mark. If you're not gonna go dark mark with it you can probably do whatever you're trying to do without the card.
Shard of Serendipity: Perhaps the only card without much use inside its own element, its a card purely for rainbows. But Entropy has always been the 'Rainbow' element, and this solidifies that.
Shard of Sacrifice: Not that good especially at its nerf outside of mono-death. This is because it drains your quanta, and unless you're using death this can be a big problem if you "need" to play it at a bad time. However in mono-death it is a beast, especially with bonewall, since your opponent needs to spam creatures to break the bonewall... but if they do then all their damage is out on the field for SoS to soak up. And in mono-death SoS costs nothing.
So yes, I can't see too many options for any shard to be played outside its own element, the fact that SoR is nearly helpless outside time just means that it was UP before the patch because it needed its time affinity to have a place worth playing.