Thanks. I'll keep an eye out on it.
Other than safety, the reason I point that out is that I frequently have to do failure analysis on sheared bolts.( especially on high impact equipment at mines and lumber mills)
By the time I get there they have gone from 5 to 8 to B-7 ( even welding heads sometimes) and they are all still snapping.
Its almost always a case of the joint and/or the fastener losing dimensional tolerance and creating those loads which result in failure.
May not be the case in your application but its a very common failure mode. Not worth the risk.
Personally I've used slightly thinner bolts (the same ones in fact) on control arms in the past on my other vehicle and drove it for years without failure.
IMHO, as I don't really want to start an argument, it really depends on the context. As I mentioned the original bolt has play within the control arm bushing as well, so the logic clearly doesn't really follow that in this case play will cause failure.
I understand the argument from safety so I will look out for any pplay, I would really be concerned if this was a low grade stainless steel bolt.