Yeah i don't understand this either, back in beta we had ST row stacking with some cards like Commander's Horn reaching insane numbers.
Then came the positional patch where row effects got limited, in the case of Commander's Horn to 5 adjacent units, yet we still have the beer now which is still row wide, reaching higher value than commander's horn.
And yeah you're gonna say that back in beta row didn't have limit, however it was also extremely difficult to fill them, since most cards spawned 1 unit, now you can get row cap in 2 cards with cows and monster's nest.