Currently the Sellsword is literally the only way a confirmed Mercenary can be untrustworthy when their target is trustworthy (and it’s trivial for a Mercenary to confirm at the moment, although I think that that’s also a major problem.) And even if you don’t trust the Mercenary’s target, there’s no reason to focus on the Mercenary when you can just focus on them.
I would seriously, no-joke suggest removing Mercenary entirely before removing Sellsword. A neutral role that can’t be doubted has absolutely no purpose in the game beyond wasting a slot and narrowing down who the evils could be simply by existing.
As for what Unseen gain by converting a Mercenary, it’s obvious - they gain another Unseen that can hopefully slip under the radar and win the game.
I think you’re also underestimating the Sellsword as a class. Retribution and Stand Guard are both very powerful - extra kills and preventing kills are a big deal. Enforcers don’t give an extra kill (they let you pierce immunity, which you don’t always need), don’t protect everyone at once, and don’t block investigations.
Finally, not all converted roles should be equal. In fact, it’s good to have differences in power, since that rewards the Cult for converting intelligently and punishes them for converting blindly - which is good.
And if you removed Sellsword, what would happen when the MM tries to convert a Mercenary? If they do it by accident, they’ve wasted half a conversion - are you seriously arguing that the Sellsword is so weak that it would be better to get nothing at all?
Conversely, if the MM knows who the Mercenary is, removing the Mastermind’s option to convert them is a flat nerf to Unseen. Why would you want to do that?
Everything about this suggestion is bad. It’s like fractially-wrong - invalid reasoning, bad for the Mercenary, bad for the Unseen, bad for the meta. The longer I think about it, the more problems I see. What on earth are you trying to accomplish? How could removing the Sellsword ever improve anything, at all? If you were asking for it to be buffed, that would be one thing, but the logic here is nonsensical.
But I want to underline how mind-bogglingly wrong this part is:
If the MM has visited the Unseen, one of two things have happened:
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The MM visited them blindly, by mistake. In that case, I refuse to believe you seriously think wasting the night is better than giving them a Sellsword. Wasting a night basically costs them half a conversion (all future conversions will be delayed one night) - it has a huge, serious impact on the Unseen. Sure, they may have made a mistake, but giving them the Sellsword is obviously preferable to giving them nothing.
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They visited the Mercenary deliberately (this is far more common), usually because they think the BD won’t expect it and the converted target will survive longer than they would otherwise. Why do you want to remove this option?
Additionally, another major issue here - Unseen will, usually, try to identify the Prince by looking for unconvertable targets. Adding more unconvertable targets makes this harder and nerfs the Unseen even further, beyond the already dramatic ways your suggestion would weaken them.
