"So why does it happened? Because other distributions became weak or PCLOS goes stronger?"
each pclinux iso released is a improvement over the previous version
from that perspective 2007 was great, 2009 was awesome and 2010, 2010 is the rule to measure how a kde4 desktop should be
comparisons are ugly but constantly happen on linux world and unfortunately, other distros doesn't evolve as fast and remain as stable as pclinux constantly do
some distros are not even evolving, frozen in time, dissolving or following a devolution process(won't say names but starts with the letter next to y in the qwerty keyboard