The ability to do one type of attack and then switch style half way through and if a state is awarded getting the state for the new style is not new. It has been around since day 1 of CR2.0 and it means that people who carefully manage their combat have a chance over those that "button-mash".
The area where it really becomes helpful is for state dependant moves. EG:
Aikido specials require Off-Balance, meaning that you need to keep doing grab attacks. Karate on the other hand requires Staggered. So a fight between Aikido and Karate needs to be carefully balanced otherwise the Karate player (whom fights using power tactic) has an instant edge over the Aikido player (whom fights with the grab tactic) ... between specials there is going to be a significant difference in damage done.
However this gets balanced by this "style change every second turn" feature. If the Aikido player fights with either Speed (to increase chance of landing an attack) or Power (to prevent dropping defence but causing more damage than grab) then they atleast get some damage done before switching to Grab and attempting to get Off-Balance. You may not think this is fair but it works for all trees. Trees that need Dazed cause less damage and have less defence. Trees that need Staggered have less defence and less chance of hitting. Trees that need Off-Balance have less chance of hitting and do less damage.
By micro-managing your fights you can partially counter-act these penalties by half (you can only use the tactic every second round).
Have you ever fought as Aikido using only grab... fights take forever and the enemy is often almost dead by the time you get to land a special due to the low hit-rate. Toggle between speed and grab and your hit rate goes up (and your defence goes down so enemy hit-rate goes up too) giving a better chance to get the state you need.
Also... when firing into interlock... pay attention to what style is being used in interlock and try to give thier enemy the state required. Firing into interlock doesn't require the enemy to have a specific state ... but the interlocker requires states to fight effectively. so If you see Kung-Fu being used by your team mate then attack the enemy with speed attack to induce dazed.
The advantages are minor but can be the turning point in a close fight
