I never said it was perfectly balanced. I said I thought it was VERY WELL BALANCED, that is not the same thing. I’m not sure if you are asking a genuine question, or trolling, so I will give the benefit of the doubt here and attempt to answer the perceived genuine question.
I don’t think in a complex game where players can choose their builds there is ever going to be such a thing as “perfect” balance. All the devs can do is make what they perceive to be a collection of average/common builds and balance those against the incoming damage; and I think they have done a great job of this.
As far as some builds doing 800 corruption and others 100, well that is down to the individual builds. Obviously every build has its individual capabilities. I personally play what I think to be well rounded builds aiming at the “middle of the road”. I prefer being on the tanky side of things rather than speedy glass cannons. I’d rather die less and go slower at higher corruption.
The beauty of a game like LE is that each player can pick builds that suit their play styles, or indeed make up their own.
The scenario you pose has little to do with dev balancing. Someone could quite easily make what “experts” would see as a terrible build, but one which that player might enjoy. The fact that it gets trashed at 250+ corruption has nothing to do with general balance, and more to do with bad mathematics and build making skills. Also, 800 corruption that you mention is hardly a typical amount of corruption. I think that pretty much most of the builds in these forums would get trashed often at 800 corruption. Again, that has little to do with balance, and more to do with a sense of sado masochism.
Also, “speed running” is subjective as well. I get your meaning, but this is more akin to something from PoE than LE. Some builds are built to combat single target, some AoE, some a hybrid. Some are Arena specific, some are Mono specific, some are hybrid.
In fact, the more I try to reply sincerely, the more difficult this is becoming. I am failing to see the purpose of your reply other than it being purely rhetorical. Perhaps you could elaborate on any question you are trying to ask of me in reply to my previous post, if indeed there is a question?