I understood you perfectly - no lack of reading comprehension on MY part. You argue that xeroth and vel deserve buffs if lux gets one. But you fail to understand.
Vel'koz can clear waves at lvl 1 with 2 spells while harassing anyone in the wave. Lux takes much longer to waveclear. Until she gets a good chunk of ap, she can't even e, auto to clear the full wave. Xerath deals more damage with his long ranged waveclear/poke and can land it through minions. Lux cannot land her combo easily through full minion wave which she has to do vs either of these champs or has to walk predictably around wave to harass while farming. Thus the other two easily win out in harass and waveclear while farming more safely. And they do it (at least in vel's case) with much lower mana cost. If lux wants to compete early game, she goes oom fast. Which is again, a win for her opponents. Furthermore, you are smoking if you think lux has more burst than vel. And don't say she has more burst than xerath - xerath is a poke champ like ezreal - not a burst champ like graves or lux. Lux can do either technically, but has been styled around low cs burst combos. If she is snowballing, yes she can delete almost anyone and looks broken because of the low cd on her ability to do so. But if she is even or behind, she isn't overwhelming in the least. Xerath might not be any better from behind (I don't play him, so idk); however I can assure you vel deals more meaningful damage more easily when behind than lux does. In no way do xerath or vel need buffs. Lux could use some love, but her ult buff isn't what she needs. On the other hand, it isn't going to make her broken either.