Eh, I think it's more about the unknown life things that happen which "may" cause someone to miss the window. People get attached to their Alts big time in CoX. For those with a handful of alts, it's not a big deal. For those who have a *coughs* "mild" case of altitis, then it can be a problem.
TBH, I rarely have naming issues even at my initial CC time, but I also don't fear doing things like using non-English variants if something is taken. Heh, I'll actually USE that change to influence the alt's Bio!