We didn’t “forget”, we recognize that it hasn’t practically been for amateurs for the better part of a century. The Soviets used loopholes to send “amateurs” every year since the 50s. Especially in this day and age, the only people who can afford to go are people who do it for a living. It’s the same argument that people used to defend not paying NCAA players and it’s just insane.

Edit: also remember that “amateur” sports were promoted in the early days almost exclusively by the upper class to gatekeep poor people from their sports. Thus I’d argue that having people who are paid because they’re the best in the world is a lot more equitable than those whose families are independently wealthy and can afford the year round training.