Multiweapons are cool and beneficial due to the nature of this coded system. Things can always be faster and smoother but in gaming things like that require dedicated programmers. Give credit for what is their in NGS, not a persistent online world is perfect.
Back to the weapon subject to ensure balance changes will be made. The PAs while not all worth being considered optimal in all cases does serve a purpose. Thats part of the reason why the combat stands out with what currently available. There is art to the flow of combat if you can master it. Partisan is incredible from a skill point investment and you can rack up alot of dps. Charge strikes most don't use, allows for movement change and even adds more functionality. Get the right series tailored to your atk focus you now finding your groove. Again the multi aspect in making two weaps one keep you keen on a intense fight (hello pure dps ARKs) as you know what PAs can serve benefit in dodging heck even parrying atks from DOLLs.
Put more training in Bujin type mobs you will see the light glissen more.