heh heh I used to play spear lann 4 years ago before I quit after vella came out, so I know what it felt like to have no invulnerability and only .20 seconds of invulnerability. Those days were when playing as a spear lann meant you were either a phoenix feathers sinkhole, or had uber gear. Anyways, I would rather have only .43 sec and shorter delay between rolls than .63 sec and longer delay which makes trying to dodge combo attacks sometimes very iffy. That is how I feel about lann also. They buffed his iframes when really they should've just buffed his mobility by giving slip dash/roll more speed, or range, or shorter delay. This would be much better because lann's mobility is garbage, especially for a high-risk melee class, and my suggestion would reward skill with more mobility, and the farming grind would feel less of a chore.
Hmm, how about allowing players to modify their invulnerability techniques by allowing them to balance out their iframes-mobility themselves within certain limits? It would allow for more gameplay variety, and would just be more fun in general. Kinda like how kai players individually have different preferred ranks for their Reload skill.