Not really on desktops, as all x86 CPUs memory models are strongly ordered. For other platforms (like ARM) it is indeed a problem if you have logical dependencies on your parameters.
Now this is only the architecture. The biggest problem is fighting the compiler optimizations, that are utilizing the inherent UB in concurrently accessing these parameters. So yes, it is actually a very real problem. You can see this more technicaly reply here, but it still seems no action have been taken from the JUCE team:
