The downranking is not even that bad. Unless you are not taking part in the content activly and as such why should you have a high key. Raiding dosent constantly give me loot just since I got aotc 3 months ago no need to keep doing the same level to get the same level of reward.
What’s going to make m plus worse is valor only from timed keys making it further a need to time vs just conplete even if only wanting weekly chest. This will make even 14s that you could get into with lower io as people made a bunch for weekly chest require even higher amount as people won’t be only going for chest but chest plus valor.
In fact the change to downgrade keys matches well with that other change as less “carried” keys as time goes on as they need to rebuy weekly or get a new Carrie weekly vs just once. As such less likely to get “bads” that have a high key from a old Carrie. Those taking part in the content is not really much of a change for: needing to time for valor thou will make keys a lot more toxic.