Ocellus-Voice-Assistant plugin is free.. have you looked ?
I think the point is, the average player does not care about Powerplay or powers 'winning'.
They only care about what
they can get out of it, as easily as possible.
Most players do not want to be ordered about, go to Reddits, use 3rd party software, Discord / Teamspeak etc. Its too much effort, or simply don't care.
By its design Powerplay needs co-ordination, its
intention was that everyone would recognise what is good and do that. Unfortunately that is not the case- players do what they want because they can and that by design we have that choice.
Having no ingame place to message each other, or contact outside of texting is a massive omission, and shows the confusion of PP underlying design.