I’ve unfortunately been expecting that eventually we’d all be forced into this ever since “Seller Experience Lab” was first rolled out back in Q3 of 2024 (081824), as alluded in this 022025 SAS post; publication of the 060226 News Headline “The new Seller Central experience is here” @ https: //sellercentral.amazon.com/seller-news/articles/QVRWUERLSUtYMERFUiNHOTRBNENMTkFFWFZDVUcz convinced me that the day was likely looming large for when the switcher would be deprecated.
Perhaps because I am not a sophomoric, game-playing Dev with no practical experience in the real world, I am not a fan.