OK, I'll bite:

> the structure of unjustified authority of the State

Socialism in all real world implementations has been in the form of an all-encompassing state. The idea that socialism can exist as a form of anarchy seems to be busted - the Soviets (as in the unions that initially formed during the Russian revolution) quickly formed into a hierarchal structure of abstract Soviets that looked just like government departments. I don't agree with the extent that the State has power either, but fundamentally it can provide security from criminal behaviour via the police, protection from outside groups via the military, and welfare via taxation. Those are all positives, imo.

> the exploitation of labour

"Ownership of the means of production" has less and less meaning every year. Everyone can start a business from a laptop, this isn't the Victorian era where most working class are forced to work in factories to escape the poor-house. It would seem that business people do provide real value after all - managing people and structuring organised work between individuals with separate skills is an incredible value-add to a workforce. Plus, the idea of the 1% owning the vast majority of the wealth in society can in large part be attributed to their owning a large share of their own businesses, which are built with their own work and hiring people at mutually-agreed-upon wages.

> the class system

The class system is becoming less and less relevant. I don't have to toil away as a serf on some rich noble's land any more. I started out very much lower-middle to working class, and now I live a very comfortable life. Economic mobility is pretty good these days, we don't live in Marx's time any more.

> the internal contradictions and crises of capitalism

... can be well-managed by a more competent state. Tragedy of the commons, neocolonialism, and such could be drastically reduced by improvements to the state. We know this because countries like Norway have good social standards and are military non-interventionist, and the USA is pretty much the only Western country that invades others any more.

> being forced by threat of starvation to sell labour-power to the class of property owners

You mean being forced to be a productive member of society? Work still needs to keep the world going, and if sitting at home consuming goods and providing absolutely no value were a viable option everyone would do it and society would collapse. For those who can't due to disability or unemployability we have welfare benefits to allow them to do exactly that.

Consider this - if people don't have to sell labour-power to earn money to buy things, but can still consume the fruits of others' labour, are they not being exploitative themselves?

> A better analogy would be if your web app is only serving 5% or less of customers, and the rest get an extremely slow connection, which they complain about to the web app owner, and you respond "We just need to make the website a few kB/s slower for the 5% and give that speed to you!"

You, like every other socialist I've spoken to, seem far more preoccupied with punishing the wealthy than actually helping the poor. If we can establish a dignified baseline for all people to live off of, what's wrong with those who are willing to work hard and sacrifice to provide better services to their customers being able to earn more? Without incentives we wouldn't have any innovation because people don't make sacrifices without incentives. Most innovation is born of personal sacrifices.