Marx never intended there to be a vanguard party, and Engels literally said, "Look at the Paris Commune. That was the Dictatorship of the Proletariat". The universal suffrage that Marx explicitly did credit to the Commune, that made the Commune closest to real statelessness and classlessness, was totally abolished by Lenin (I think he actually called it "bourgeoise fetishism" in one critique).
Marx also never defined DotP in terms of violence, it was purely about class rule by the proletariat over the bourgeoise, as where Lenin explicitly defined it as requiring violent suppression of the bourgeoise by the proletariat. Marx always left open peaceful transitions to socialist rule, whereas Lenin explicitly ruled that out, and their definitions of DotP are at their core unaligned because of that. DotP was, to Marx, what happened as the state began to dissolve towards actual stateless Communism. To Lenin, it was (as I said before) a mandate to state power for the party (insert "stop resisting, you're being liberated" meme).
Whether you think Lenin was justified given his circumstances, a minority class of 'party-conscious' executives "leading" the proletariat while also suppressing and later banning rival socialist parties and party factions, is absolutely not what Marx intended DotP to look like.
Lenin also asserted the inability of the proletariat to form class consciousness in ways that, to me as a non-Leninist look like a validation of Trotsky's early criticisms (and obviously Trotsky was right in the end about 'substitutionism', and about Stalin). Lenin couldn't openly disparage proletariat rule for obvious reasons, but he did attempt to draw heavy distinctions between the proletariat and revolutionary leaders themselves, such as asserting that the proletariat would only achieve "trade-union consciousness" without the party (leaders) there to essentially save them from themselves.
It's funny you explicitly contrast Marxism against anarchism, because that feels like the colloquial meaning of anarchism? Otherwise, you're essentially ruling out the eventual dissolution of State and Class, which is a form of anarchism.