Sometimes an illness cannot be cured, so I might agree with this. Anyway, living in itself is technically pointless if we're all going to die at some point either way. When we die, it's not like what we did ever mattered. I'm not saying people should commit suicide. I advocate against that daily. I'm just saying that in general that this person makes a good point.
I do share all the views that you have stated in that post, with the exception of your belief on suicide. I think that to prevent the painful ways that people choose to end their demise we need to implement safer modes, specifically, physician assisted suicide, or euthanasia.
I've lost two family members to cancer, they both suffered, and I will never ever know what they had been through. That's why it's a lot easier for me to say bullshit like "Killing yourself is not the answer" or "It is all temporary, it will be over soon". No, I don't know their pain, and it's very insensitive and hurtful to do that.
I know how you feel. Mental illness or physical illness, no, we don't know somebody else's pain. To advocate suicide is going to be very frowned down upon though. The concern of businesses not achieving goals without workers will be threatening if the workers decide to commit suicide from anxiety. That's an illness. Same situation applies to certain religions. I had read somewhere that the Christian religion told their followers that if you were to kill yourself, you would burn for eternity to just scare them from ending their own lives. I could be wrong about that statement, so I will relook it up. When judgment day comes, you could've argued saying that it's not like you even asked to be born. It doesn't matter though. That's not your choice.
The point I'm trying to make, or the point society made is that you don't belong to yourself. You belong to the world. That's why cryptocurrencies like bitcoin are heavily frowned down upon. There's no way to place tax on this currency, which denied the ability of the government taxing your earnings to use your money to build roads, build schools, build homes, and so on.