I also think this is probably the most urgent thing to address.
Low-level instances are really unpleasant to go through. They should take inspiration from the mobile version, which does things better than the PC version for this type of content.
Yes, they should implement a kit similar to the max-level kit while adjusting animations and power.
But will they allocate that many resources to the combat system, knowing that they also need to make major changes to max-level jobs? Only time will tell.