Would much rather have an alternate approach that takes inspiration from other games (and systems of old-WoW) where you would get a currency from each Paragon chest which would be expansion specific and you can have these as an alternative progression path.
The idea here is to have a defined end goal rather than disappointment when you don’t get it. it would also serve as a motivation to complete the content.
From the perspective of someone hunting something specific, then if you “loot it early” then your currencies can be used elsewhere.
From the collector perspective. You knew what you signed up for. I look forward to the reddit posts about having enough currency and looting it on your last paragon making your currency useless. But hey, at least you have an end goal now.