How do we build against "true damage"??
Yes, I understand that true damage is there for a reason, and it's designed to counter Super tanks. As an example Vayne's true damage is designed to demolish huge armor champs like Taric, and Rammus. For example; at times an enemy Sion can seem unkillable. So of course I would like to see some champions with the ability to kill them, but I think these more recent concepts about true damage are a bit...... stupid (I don't feel like using some another word to make it sound like it was an accident It wasn't.)
Fiora's new rework is an amazing example of this. At mid game with her ult up, she can hit 15-20% max health in true damage per hit to her target'd champion. Now, this isn't including her massive damage she does normally. cough cough 360-440 ad cough cough She can completely destroy a bruiser, then move onto the rest of their team. Not to mention healing herself along with her entire team in the process.
I like true damage, when it's capped, and doesn't scale on health make sense. Darius, and Cho'gath have large outputs of true damage. However, these come from their respective ultimate's, and not passive abilities. Cho'gath can reach 1000+ true damage to a single target, if he builds full ap. But as a result, he is too squishy to survive in team-fights. Darius on the other hand has to make use of all of his skills to get his ult to its full potential. Getting 6 stacks quickly before the enemy fighter can butcher you isn't as easy as you might think. (especially if they bait out your abilities, or build quicksilver sash) I do sometimes think the damage on these abilities is a bit excessive at times, but I agree that it is not unprecedented, and it is generally well balanced.
Consistent true damage without being too massive also makes sense. Certain champions have the ability to bust tanks, but don't rely fully on their true damage to get things done. Master yi, Irelia, and Corki have true damage built into their kits, but when all is said and done, the damage of their basic attacks and other abilities will far out weigh that of their true damage.
Now, in league's past, to build against champions like Darius, Vel'koz, and other similar champions, you built health. But when it comes to Vayne and Fiora, that's actually digging yourself deeper into a grave. Even if you build armor, the true damage is still too much to deal with.
I would like to sum up real quick. I think true damage is fine, when it's properly implemented and a champion doesn't completely rely on it for everything. I think riot is getting to generous with the amount of champions they give true damage to and the magnitude at which they dish it out. Just reconsider the use of true damage in places where a simple conversion to magic damage would more than suffice.