They buried entire PMFs (abandoned ones long crushed by another PMF, yes) for over a year under an unassailable Thargoid invasion which completely depopulated their systems. Several larger PMFs lost a substantial number of their systems to the same.It's a systemic problem intertwined with the BGS and they are not going to let it break the existing factions and systems that are established
They closed down PMF addition 18 months ago with a news post which - read in hindsight - clearly says "we are going to bring in Powerplay as a replacement for this sort of territory control game" (Maybe colonisation, too, was planned back then? It also fits their description of their plans.)
They haven't announced any balancing changes to the BGS itself for almost two years.
Are you sure that they care in the slightest if the influence of the Swedish Bobcats in HIP 1234 is 15% higher or lower than the supporting player group prefers? Because I don't think Frontier have shown any sign of caring about that for a long time.
The BGS still "works" in the sense of influence moving up and down, states changing, wars starting, trade goods changing price, etc. Beyond that, I think PMF supporters are on their own if they want particular outcomes.