but you have many capitalists competing, so the power is kinda distributed inside the capitalist class.
This isn’t always true, and is arguably not the natural state of capitalism. Capitalism, without state intervention, will tend towards monopoly as economies of scale and market power push out any competition.
Note: all of this is steal manning dengism, I am not a tankie advocating for it
They are in the first stage. Classical Marxist theory divides development into two revolutions / stages:
The first revolution is the bourgeoisie overthrowing the feudal order, eg. The American revolution, the English civil war, French revolution of 1830. After the bourgeoisie take over they will use the proletariat to industrialize and develop the means of production. This will eventually lead to a boom in efficiency and production, the peasants moving from the countryside to cities, and abundance of necessities. Eventually though everyone’s needs will be met and without an expanding market to profit from capitalist will be forced to produce more efficiently with less labor to get profits from there now limited market. This will lead to mass layoffs and unemployment which leads to
The socialist revolution where the proletariat overthrow the bourgeoisie and sieze the productive forces. They will then distribute labor fairly so you have 8 people working 10 hours instead of 1 person working 80 and 7 others unemployed. This then leads to communism where people have control over production and use it to guarantee well being and leisure instead of profit.
In order to get to this communist phase though you need to industrialize and develop the means of production so you can provide people with basic needs with little labor. The problem is the two major countries where socialism took hold, Russia and China, were still largely agrarian feudal societies. So they had to develop the means of production, Russia, and maoist china did so with 5 year plans, which had some success and some catastrophic failure but was ultimately pretty inefficient. So after mao a new leader in China named deng Xiao ping took over and followed a policy of allowing capitalism into the country to develop the means of production and industrialize. This unleashed powerful forces in the country that needed to be tamed by an even more powerful state, otherwise they would take over like they did in other capitalist countries. Then all the bloodshed from the original Chinese revolution would be for not as they would have to do another revolution to remove the bourgeoisie again. So the state maintains tight control to avoid “regressing” into a capitalist democracy until they fully develop and industrialize. At which point they will use that powerful authoritarian state to disposses the capitalist class and usher in communism.
The dictatorship of the proletariat was supposed to describe the will of a fully conscious proletariat majority being executed by and with the consent of that class. In other words a democracy unclouded by bourgeois interest and false consciousness.
The problem was that at the time of the Russian revolution the proletariat weren’t the majority, the peasants were, and what proletariat there were lacked full class consciousness. So Lenin used the vanguard party to emulate what a dictatorship of the proletariat would do, but that wasn’t an actual one as Marxist would’ve described.
One thing I’ll add that I haven’t seen mentioned is communisms relative weakness in the propaganda department. If you look at democracy as a bunch of competing interest groups i.e. parties trying to win the masses over to there side to win, then there main tool / weapon is information that will make the opposition look bad and your side look good, i.e. propaganda. Good propaganda requires intimate knowledge of people’s desires and a knowledge of how to shape those desires to the benefit of your program. Capitalism is very good at this due to competition forcing them to better understand there customer so they can sell them more. Capitalism creates great salesman which is fundamentally what you need to create good propaganda. You can see this expertise most plainly in advertising pushing the message that consumption is good, fulfilling and will make you happy.
This expertise combined with the large amount of resources capital can Marshall to push there message makes electoral politics extremely difficult for communism or any program that goes against consumption like environmentalism. Even if you completely eliminate capital and it’s control over media in one nation foreign actors will still come in using the same expertise and resources to try and bring back capitalism. So since communists can’t compete electorally with a free press they go towards autocracy to keep power.