Some games such as Cinemaware, Lucasfilm are really hard to fix as they often use lot of system call. Without a Kick1.3 emul it should need lot of works (when it's possible to fix them without it). Of course some WHDLoad members can choose to use kick1.3 emul for an "easier/faster" fix. Personnaly i don't really care, all what i ask is to be able to run a game/demo fully on my A1200 without any bugs. If a WHDLoad member want to check his skill and have fun to fix a game without any kick1.3 image, he can still do that.
Here was just an user opinion, now i'm waiting for a more advanced answer by some WHDLoad members.