I have Dwarf, Lizardmen and Orc armies. With a combined
total of two mounted units.

Safe to say, I like infantry armies.
The change is very much to my advantage. No complaint from me.

"behind another" isn't really open to any interpretation.
If the rule has changed to remove the requirement to be behind. I'm happy with that.
I'm just curious if I may have "missed" any other rules, in Warmaster Revolution, that are different from the text of the rules.
As long as I know that's the rule.