Exactly. That's why Marxism is irrelevant to a real revolutionary movement. I think Utopian Socialism, with not theory just practice, will likely be the expression of socialism when the time comes in the future, and I say this as a Marxist.

You're not a Marxist, or if you strongly believe you're one and actually read works of Marx and Engels, then you're a bad Marxist. Revolutions are not won over ideologies. In a very utopian future if suddenly everyone becomes communists and overthrow the bourgeois state, this does not directly imply revolution will be successful. You need to do something the day after the revolution. And that something cannot be something dictated by an elite or anything like that. That something must be class dominance, and class dominance not on ideology but on material conditions.

Take bourgeois revolutions. When bourgeoisie overthrew the aristocracy they did not replace them. Particular individuals among burghers or peasants did not not become new kings, dukes, barons etc... They changed the society in a way property rights served their interests. They took away the rights of landed property and declared the rights of private property. They dominated as a class, not as individuals. Only then, their revolutions were successful. This will be done by proletariat too. When the time comes, they will dominate the society as a class.

Saying "if we try hard enough we can crush capitalism" is very much like "if we downvote reddit admins hard enough we can overthrow them". That's not how it works. Society functions in a particular way, in a way material conditions affect people's lives. Therefore, if you want to overthrow something you should understand how it works and act accordingly.