The authority of the Inquisition is indeed absolute, but the issue is more the idea of finding a Skitarii on their lonesome, intact, in a prison cell and used as literal cannon fodder alongside hive scum, feels very contrived. A Skitarii is also just in general a higher level of combatant than the existing classes. Same way we have Zealots, but don’t have actual Sororitas that would be more comparable to a Skitarii.
That’s the origin Fatshark went with and how they present the game and interact with the fan base however, so that’s how I’ve been viewing the idea of a Skitarii inclusion.
Not immediately however (as you do have to level up to get access to different weapons), and aside from Thunderhammers, they’re all weapons you can find or that are available in some form to the most basic of Guard infantry units (even if they may not be ubiquitous).
Likewise, even the most basic and weak of psykers, with no business and no ability in melee combat, get powerful psychic weapons, as without something to channel those powers they’re significantly less useful. Hence why in the current tabletop game, an otherwise largely helpless Astropath gets a stick that lets them hit (with their single attack) harder than an Ogryn.
Thunderhammers are really the only weapon that stands out as particularly odd, especially as we don’t have Powerfists which are ostensibly simpler. But everything else in this game one could find in a basic Guard combat patrol and be completely unsurprised.
Having an alternative origin would help that aspect, though it would be a departure from the current batch of characters.
Aye yeah, where a Skitarii would feel out of place, a Tech Adept or the like I could see working just fine.