It really isn't:This is straight up wrong? We existed before the imperium and we're working alongside it due to treaties made with the emperor, which is completely different from branches of government he or his successors created of whole cloth.
Adeptus Mechanicus - Warhammer 40k - Lexicanum
wh40k.lexicanum.com
While the Adeptus Mechanicus is a part of the Imperium, it has developed separately and enjoys a considerable degree of independence.
Fabricator General Kane's representative on the Council of Terra, proposed to resolve this by the creation of a new Adeptus, the Adeptus Mechanicus.
So yeah the Mechanicum officially joined the Imperium after the Horus Heresy. Besides we have been conjoined with the Imperium for so long that we might as well be the same empire.
They aren't xenos though and name one xenos protectorate that exists in modern 40k.The Imperium is a bad ally, but the fact that they are an ally shows that Xenos Protectorates are possible.
See above.The Mechanicus is a separate organisation that is allied with the Imperium, we are one of the heads of the Aquila with the other head being the Imperium.
But how about we ask @Magus Explorator about our connection to the Imperium.
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