The difference is that they announced these changes in advance. And even in game they add ! icons to all the vehicles that were going to be moved. This is a big difference between the game and IRL stores. Stores do not tell you that they are going to have a sale next week and that you should wait to purchase the item. Gaijin took multiple steps to inform the playerbase well ahead of the changes.
I had enough time to grind out all the top vehicles in my US and German trees with my premium vehicles so that I could get my max efficiency research points before they were moved out of range of my prem vehicle’s “maximum research efficiency”. I had no issues preparing ahead of time.
