I concur with your point wrt library version - but, even so, differing versions can be mitigated for by having a base/stable version installed in the NFS mounted library and a different version installed locally to the machine as necessary - assuming a suitable PERL5LIB, perl on that machine will thus pick up the localised version in preference to the base/stable version.

I infer from Network latency. The dreaded slow NFS mount problem... that you're only considering auto/soft mounts - a hard mount will remain for as long as the mount server is providing the resource &/or the network is up.

From NFS mount goes away..., I take it that either your network &/or your mount server aren't as stable as most...

Overall, it appears as though the local installation of libraries is the preferred, labour intensive work-round for network problems...