I get it. MMOs can be deep social experiences, making memories you'll carry with you forever. If a X-LFG is the lynchpin that ruins your ability to keep doing that, perhaps you should find a different medium with which to make friends and have relationships?
As far as "Community", again if a simple grouping mechanic is the Black Plague of your community, perhaps it it's just time for your community to be buried in a mass grave. Just like Europe in the 15th century, new communities will spring up and rebuild.