There are some discussions about this topic in France too, and let me explain my POV to you: I am leaning toward anarcho-communism, but it’s not represented by any big political party. The compromise I can make is LFI, as they are able to criticize capitalism. Other left party are like “I don’t know what else” for the greens, our communist party does not use class warfare since a long time, and the socialist party has always betrayed any idea of left politic. Any alliance between LFI and such parties would mean compromission at some point. I’d rather have them over promise on the left to apply social policies, that compromise with the socialists and having nothing done.

In the end, it usually boils down to political orientation that are fundamentally inconsistent, eg social-liberalism and social democratism. And if you ask me, being pro-capital is right leaning, as trying to be socialist with capitalism in place is doomed to fail in the end