Yeah I get what you are saying and you are probably right, I do feel like I have shed my naive and idealistic phase that we all go through as teens but I think it goes deeper than that. I don't think any changes to the system or to the government matter as much as a general change in culture and personal behaviour.
For example if everyone came together and were charitable and kind and hard working capitalism would be amazing, it would lead to real third world economic growth and allow real competition with local businesses to challenge monopolies. Corporations would choose 500 million profit rather than 2 billion a year and pay workers decent wages etc.
Same with communism, if everyone truly came together and said lets be good to one another, lets work hard and have a truly publicly owned mode of production and lets not try and seize power and have rampant corruption and repression, then people could live in an amazing society where human needs outweigh monetary profit.
I don't think capitalism, communism, big government, small government, no state, far reaching state matters if the culture and human behaviour is bad. I am not really someone who thinks it will or even can change though so that leaves me at the bottom of an enormous hill with a boulder.