Are there any technical reasons that prevent WP to be part of Framework Interop Group?

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Yes, WordPress's maintains backward compatibility (spaghetti), it would not be feasible to adhere to PSR-0 and rename everything, which is somewhat unfortunate for the long-term, with regards to FIG.

That being said it's possible to adopt it for plugins and themes, there is a trac about it here: https://core.trac.wordpress.org/ticket/21300

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