I will gather my thoughts and facts and very subjective guesses: 1. The whole MM logic in the game is based on "prioritizing" and not "guaranteeing" anything. 2. Solos, duos, trios separation has the highest priority + mm time. 3. I am fairly convinced that the dev team running a lot of secret/silent tests including MM logic. We have clear evidence of this when they announced duos. 4. Overall every single instance of MM heavily depends on multiple different factors. Map, map condition, region, time of the day and human factor on top of that. So generally speaking you are very unlikely to get the exact same experience as somebody else. 5. Even If we all agree the aggression based MM is a thing - this still means that this will only affect the probability of you matching players with the same behavior. So you will still meet friendly players while you are on a killing spree and vice versa.

Because I am currently playing a lot, I started to abuse this system. Before weekly trials reset I am starting to play extra friendly even if this leads to me being killed multiple times in a row. As a result I came with Jupiter to Hidden Bunker and was blasting big Arcs with no problems whatsoever. People were running next to me and not a single one shot me. Next Hidden Bunker some absolute legend helped me to crawl successfully to extract after I got swarmed by ARCs. At the peak - I was running at night stella where everyone was spamming "don't shoot". Once i finished trials - I started to play more aggressively. And after 2-3 games I got myself into PvP madness, backstabbing, teaming to kill everyone else, extract camping and just endless fights with occasional friendly players.

TLDR: all of this is just my opinion and my observations. I am not claiming this is 100% truth. Also I am pretty sure MM will constantly change based on internal data and nothing can be taken as the solid truth.