Not insisting it needs to be in, but the vehicle question was intended to possibly alleviate the necessity to have every large item as a store exclusive. For instance, the TIEs have been tough to find in some areas, and probably cost more than they need to. However, TIEs will always sell if the price is reasonable. If they ran an extra, possibly smaller, run each year (so as to avoid the tax issue), they could theoretically keep them on their website in generic packaging.
The joint thing may not be super-duper common, but I've had a Tessek, Snake Eyes, Biohazard Viper, and now Oola suffer from it. Thankfully, I was able to replace the Snake Eyes and Tessek almost immediately, and the Biohazard Viper was in a multipack I got on clearance for custom fodder, so that was no big deal.