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It's probably not useless, but it may not be worth the time and effort either.
The other person's arm look like it failed because the arm was already cracked. If you look at the break point, there is rust on the lower half. It looks like it was failing over time and then finally gave out, probably because the poly bushing ran out of grease and created a ton of friction slowly wearing the arm out. At least that's what it looks like.
For the rear upper arms, I really don't think it's necessary. For the lowers, I can see some benefit due to the sway bar loading on both ends and the TC rod in the front. Boxing them in on the bottom will stiffen them in ways that will benefit.
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