Edit: After reviewing the commenters thoughts below. I'm changing my opinion. Exotics in destiny weren't intented to be rare or hard to obtain. Exotic simply meant they have unique perks. My understanding off something that is exotic accounts to rarity, not uniqueness, which is why I didn't understand the point of Xur.
Using strange coins or RNG to get exotics are both acceptable,because "exotic" does not equate to rarity.
I'm going to hide this post. Thanks for all the feedback!
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Not really, welfare is more of a handout. Atleast with Xúr you have to use a currency.