Prob beating a dead horse here, but why allow solo or private to effect system INF in open?
If you want to play solo fine, but why allow it to effect others game?
As walter2 said.. very beaten, very dead horse.
Reason is the BGS exists to create a living, breathing universe which reacts to all players actions, regardless of mode. Lots of statements by FD support that.
That players have adopted it as a strategic "chess game" was unintended[1], and not the core intent of the BGS. FD even said they were surprised how attached players got to the minor factions, expecting them more to gave affection for the superpowers (fed, imp, alliance). Powerplay, like it or not, is the system FD delivered to provide that strategic chess game functionality.
[1] whether FD were naive to think that, or whether they should change that stance given their acknowledgement that players do this is a separate debate.