This is not the case - the two writing systems in the same documents do cause problems - merely different problems. The advantage of a technical fix to the character problem to have one version is that the problems don't grow with time, where as diverged versions do. The problem set of making two characters sets work isn't a fast moving target, where as keeping up with two sets of wikipedians is.
Stirling, What you said is what I want to say, but my English is poor.