I.e it wasn't fashionable, didn't make for good career advancement for anyone to look into it let alone say it.
>In this comment section it seems people really want it to be one or the other, evidence be damned.
I'm just here to remind everyone that the "professionals" are fallible and subject to industry circle jerks.
You rushed here to slander people working in the field without familiarizing yourself with the first things about it. Shame on you.
I personally wouldn't put the “shame” onto GP.
Historians hold out on claims made in historical sources -- especially when written centuries after the fact -- all the time, it is a standard scientific practice to seek external evidence.