"Defer" was a poor choice of words. However, I am trained neither in Science or Mathematics. I am a mere armchair intellectual, and even in this, only when I arrive home late at night.
But I happen to be interested (most likely due to narcissism) in my personal genetic history, as well as the broader genetic history of Europe in general. Therefore, what I read on the Eupedia site I more or less take on "Faith," albeit I must somehow weigh, and struggle to make sense of, the often technical arguments on threads here
As for testing beyond PF6863, I tested NEGATIVE for Z6032 and another SNP with YSEQ. I was then advised to take the "Big Y" test with FTDNA, but I balked at the price. I decided it would be wise to wait several years until the science advances further.
But I must say that your research appears to reach far beyond the limits of current studies, attempting to "calculate" how long it took certain haplogroup sublcades to advance across Europe, as well as the haplogroups with which these movements likely occurred in conjunction. Example, G-CTS342 in tandem with R1b-U152
Any such finding would come as a revelation to me. Although we are all ultimately the product of our autosomal DNA, we somehow "identify," at least if we are men, with the Y line. As a G2a person, I have conceived of myself in recent years as an Oenotrian, a Pelasgian, a broadly Minoan heir. Perhaps I must now hypothesize that I am Oscan or perhaps even Roman.
My family roots are in the farming villages in the hills above Tropea, in Calabria ----> not a particularly remote area of Calabria ---> Perhaps the terrain was sufficiently mountainous to ward-off outside peoples, although I believe that Vibo & Tropea were Greek (J2?) colonies in Magna Graecia times, and, moreover, I believe there were Roman colonies (Hipponium) established in the area circa 200 BCE, plus in more recent times Greek Byzantine & Latin Benedictine monasteries (circa 1000 AD)