Because v0.7.5 features major structural splits from the early Negative Influence builds, legacy save files from v0.6 or lower generally conflict with the new flags, requiring a fresh playthrough to experience the integrated story line smoothly.
And that contrast, right there, is the entire point. Mental Blast Negative Power -v0.7.5- By DiDongo
As this is a pre-release build, some roughness is expected. Users on the official DiDongo Discord report: Because v0