- https://bugs.eclipse.org/bugs/show_bug.cgi?id=244313 affects PSF import too.
- making this an optional dependency not a solution: ImportProjectSetOperation fails silently without a compatibility layer, providing no feedback to user and causes him to guess what happend. Not the best way.
- however, mandating compatibility layer for EGit globally not a good solution too.

The only way to implement this feature while not mandating a compatibility layer is to move PSF support into a feature patch/separate feature.