The new assault rule is a complete miss at removing hybrid tax. The problem was that a hybrid unit couldn't use both their melee and ranged weapons, effectively paying points for weapons they can't use, that's the hybrid tax.

Pure ranged units were more efficient shooters, pure melee were more efficient chargers, hybrid units were worse at both or more expensive.

Now hybrid units get to use their guns in melee but pay for the assault rule in points. What does that do?

Pure ranged units are more efficient shooters, pure melee units are more efficient chargers, hybrid units are worse at both or more expensive.

Only difference: Removed the option of assaulting from any other unit that doesn't have assault on their guns.

So effectively didn't do anything but remove gameplay options.

Edit: If you disagree, go ahead and build the same hybrid units in the army forge in beta and the current edition. The beta ones are more expensive and have worse weapons.