Are the WordPress Core CSS styles really all nessesary?

The most definitive and up to date answer about best practice can come probably only from the wordpress.org theme review team, and right now they are different from the codex. just quoting it here, but I’m sure it might change with time

Themes are required to support the following WordPress-defined CSS classes, or similar elements:

 Alignment Classes:
    .aligncenter
    .alignleft
    .alignright 

Caption Related Classes:
    .wp-caption
    .wp-caption-text
    .gallery-caption 

Post Classes:
    .sticky 

Comment Classes:
    .bypostauthor

While needing to be present in the stylesheet, .sticky and
.bypostauthor can remain empty (unstyled) if desired. The intent is
simply to ensure that theme developers have considered all classes
generated by WordPress

By this it doesn’t look like you have to have all the CSS rules that are listed in the codex page you pointed to.

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