I don't think the pitch issue is overstated at all, if anything the technique erosion from T20s played more is being pressed too much rather than talent drain in some countries. I don't buy suddenly that batters with decent records in good batting eras (greats aside) prior to the T20 or even ODI influences would carry on fine having to deal with the pitch variety, skilled and deep attacks in home conditions and the existence of DRS as a whole.