FYI your friend may work for Tandy but some of his info is off the mark. Yes Tandy?LF does sell mostly imports and mostly South American or Mexican - quality varies considerably some times good but unfortunately more often mediocre, but there are still two major tanners of veg-tan leather in the US, Wickett & Craig and Herman Oak Leather, both offer premium quality hides that are used by the majority of professional leather crafters. There are also some very good hides imported from Europe - RJF Leathers sells some of the best hides I've used in the last 20 years which are old style pit tanned hides from Portugal.
As for upholstery hides the best come from France or Italy. There are a couple of tannerys in the US that do upholstery hides, but due to the EPA regs most tanneries of either veg or chrome tanned leather have had to close in the US and those like Herman Oak have had to re-do there process to meet the standards.
Upholstery hides are left full size because of the large areas often needed to be covered without piecing, plus they are split thin before tanning making them much easier to handle.
Veg tan, most of which now comes from yearlings with a few tanneries handling larger/older bull hides, on the other hand is generally left at full thickness when being tanned so being split makes them easier to handle. Thinner sizes are generally split from thicker hides after tanning.