I'm old enough to remember when the tasting room was a plank across a couple of barrels in a corner of the actual winery. You walked in, got a small, cheap excuse for a wine glass, the tasting list was on a chalkboard on the wall, and you tasted while standing at the bar. You either purchased or you didn't, but you went on your merry way after a half hour, no charge. The purpose, like the tasting room, was simple, to introduce you to their wines and hope to make you a customer.
Things have changed. It's not everywhere, but the Disneyland style is spreading.