Did this post timetravel from 2019? All those units you mention have been nerfed on multiple occasions, except for the scott that saw a buff and thus thats the controversial unit
with the latest patch, some changes to scotts made it a barrage weapon.
USF players quickly figured out that pathfinders give a significant vision for the player, AND can fight off most infantry with the BAR upgrade. The result is a nasty shock with scott spammers being able to spot support weapons and blowing them apart, and MGs being made almost useless because USF always saw them in advance.
This made all axis players complain, naturally