When Did Presales Suddenly Become Cool?

Why are Tech Investors in a feeding frenzy over the PreSales toolkit? Actually, why are so many entrepreneurs launching tools aimed at PreSales?

Why are some Tech companies hiring far more PreSales/SCs/SEs than Sales/AEs?

Why is the PreSales focus moving away from demos to influencing, advising, buyer coaching and thought leadership?

And most importantly, when did we become cool?