Disagree. Skyrim has all kinds of problems that an openSK could address.

- 60fps cap

- no native support on mac/linux

- engine bugs/limitations

Open open source engine would be absolutely huge for stability & moddability. Stock Skyrim SE mostly runs fine, but is still prone to crashing, corrupting save files, etc.

Many of those can be addressed by mods such as the Unofficial Skyrim Special Edition Patch and various mods aimed at overhauling the save system but an open source engine would be really great.

Skyrim doesn't have a native Linux version, OpenMW does.