What problems? The only thing the changes did was to remove the squad's lower vulnerability to AOE weapons, which had no place in the game since it was neither thematic nor communicated to the player (unlike Shocktrooper armor for example that is shown cosmetically).
The problem is that you felt the need to remove it in the first place. Rangers were not causing any issues, at the same time they were doing their job just fine.
Why even touch them when there are so many garbage units in usf roster that need some buffs/rework?
The DMG reduction was very thematic as Rangers are supposed to charge at enemy positions alongside Pershing (Combined Arms ability suggests this use of Rangers) and they need to get close to do some damage, having DMG reduction was helpful to avoid being blown up by random tank or mortar shell.
DMG reduction wasnt communicated to players... And how is vetted JLI insane received accuracy communicated to players? Maybe make them ballerinas jumping around?
Rangers had DMG reduction for years and it didnt cause any issues (while many other units were breaking game balance) and now, in 2019, you say it has no place in the game. Thats very random statement. Just for clarification, elite squad with frag nade as their only "feature" has place in the game?