Patch 1.5.97 ((better)) — Unofficial Skyrim Special Edition

The single biggest reason. Hundreds of essential mods—like .NET Script Framework (used for crash logging and advanced modding), No Grass in Objects , and certain animation frameworks—were never updated for AE. They only run on 1.5.97.

"Fishing" or "Survival" mode messages appear (if using Best of Both Worlds). Unofficial Skyrim Special Edition Patch 1.5.97

The 1.5.97 ecosystem is a known quantity. It has been stress-tested by millions of players over years. Unlike the post-Anniversary Edition period, which saw frequent, unannounced Bethesda updates that broke SKSE and DLL mods, version 1.5.97 is static. Once your load order works, it stays working. USSEP 1.5.97 is a cornerstone of that static, reliable environment. The single biggest reason