FYI: From the Link in the OP's post.
Matchmaking Improvements
9.22’S update will improve the matchmaker to allow tankers to encounter different Battle Modes (in your preferred list) more often.
This means, in your next Random Battle, the mode (Standard, Assault, Encounter, or Grand Battle) has less chance of reoccurring if you’ve already fought one.
This will help avoid encountering the same Battle Mode several times in a row (more often with Grand Battles). But entering a Grand Battle every other match is still possible.
To get the most out of the new mechanic, the matchmaker needs data on the last 50 matches played after 9.22’s release. It works best when you’ve played 50+ battles after the update.
When it takes too long to assign a player to a battle, the matchmaker may add extra Battle Modes to those you’ve marked. If the wait takes more than 50 seconds, you’ll enter the first available match in any mode.
Dose this mean if I have Assault not checked off, I may get an Assault game if waiting more that 50 seconds?
Disclaimer: My post was sarcasm.
Edited by riff_, Feb 07 2018 - 22:15.