The explanation gets technical, so read the Reddit thread for the full deets. 'This changes the way that the code is generated in a way that forces mod developers to start from scratch finding functions and writing hooks,' extrwi said. The problem according to extrwi, who says they've spoken with Bethesda, is that the update hitting Skrim SE alongside the Anniversary Edition will compile the game with a newer version of Visual Studio-and that will have a side-effect of breaking the known routes to tap into it. Many, many mods rely on SKSE, and some mods tap deeper into Skyrim in other ways. SKSE is a tool which lets mods do more than Skyrim's official mod tools allow, tapping deeper into the game to do fancier things.