Mate i hear what you're saying but either way old or new it is what it is, I get frustrated with the moving district crap myself but it happens for a reason.. The match making isn't based on threat or skill its based on whats available at the time of readying up after that it rounds out based on who else is waiting for a mission vs groups of people..
Threat level districts were easily manipulated by detreating and getting in to a lesser threat district where you wouldnt even get moved if you gained the higher threat level back, it was torture so bringing that back wont solve nothing either.. The is simply no possible way to make the game "fair" to every single person..
And on the subject of being pushed to buy Armas guns i think its still as much of a choice we make instead of a company holding a gun to our heads.. you can [through time] match any armas bought weapon with an ingame "F2P" weapon and mods, hell a T can even play during bonus jkt events\days and buy open slot weapons from the joker store the day they join and never have to buy a gun from armas..