Why does modern day SALES require more sophistication than ever before?

In earlier times in absence of internet and social media it was INFORMATION ASYMMETRY and hence SELLERS had an upper hand over BUYERS.

In the modern day due to proliferation of internet and social media the balance has heavily shifted in favor of BUYER due to INFORMATION PARITY.

Thus from CAVEAT EMPTOR we are in the age of CAVEAT VENDITOR with advantage and data fully at the disposal of the buyer.

Thus SELLING needs highly skilled SALES PEOPLE more than ever before.