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"prototype" and "mule" mean two different things in the industry.
A Mule would simply be the architecture, chassis and powertrain in another vehicles body. The body is done later.
A Prototype pretty much represents the finished product. Often lights are the last thing to be added.
They haven't disappeared, they just aren't doing the mass group road trips now.
As for things being wrong? Yes, there are. That's why they test so much so that they can find issues and resolve them before production. It's the process. But it would way out of process for something to be so wrong that they grounded the fleet so to speak.
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"Speed, it seems to me, provides the one genuinely modern pleasure." - Aldous Huxley
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