Spoilers are not copied, but it was all your maths.
I clearly agree with your maths, chances are quite low if you consider an average difficulty roll.For a hard difficulty roll, you go under 50% chance of success if your not maxed.
Which is it? Because that's NOT what the math showed.
What I mean is that, even with a maxed Charisma, you never have auto successes even at level 20 (chances are fairly equal at every level).
They are not.
So, if you plan on being the face of your party and really blast all Diplomacy/Bluff/Intimidate checks, going full Charisma is useful.
It is a very slight advantage that's overkill compared with being able to contribute directly because...
It's not a weakness to me. Your healing is quite high, thanks to Get'Em and Hurry you have a clear impact on your team ability to deal damage.
An envoy that can shoot can also get em and hurry. An envoy is limited by their action economy and having a higher charisma doesn't help that.
your healing is quite low no matter what you do. It absolutely doesn't scale well compared to the hits you're taking at that level: you're far better off having your meatshield guarded step away or towards the bad guy guy.
You are less polyvalent, but, in my opinion (I insist on this one) you have a higher impact on battle than a balanced Envoy, because support improvisations are better in action efficiency.
Hurry doesn't care what your charisma is
Get em doesn't care what your charisma isThe only thing that remotely cares what your charisma is is inspiring boost, and that barely cares. At 20th level you're healing 60 points with a 10 charisma or 68? points with charisma maxed. A 12% difference once... Also keep in mind that at 20th level something hits for over 200 points of damage on a full attack.
Get em is the irreplaceable buff. Operatives can flat foot people. There is no other get em in the game. You can shoot while you get em, and there's no reason not to be good at it.
And anyway, I'm not saying that Envoy has to be build that way, just that it's a valid build, and I'm sad that this possibility doesn't exist with a Biohacker.
Besides preconceptions there isn't any advantage to building that way.
First off, I think you have an overly rosy view of how viable that is.
Secondly, if something was made as buff happy as the envoy, it would be pretty much eating the envoys lunch. Staying out of another classes design space is a thing with new classes.
I think this discussion will be a long one, and this is not the thread for it, and I don't find private messages. So, I'll end up with a "Let's agree to disagree", unless we find a proper channel to finish it.
A pubilc service note for all biohackers:
1) you can preload your darts into your gun, but then you have to declare what they are
2) Zeizieger weapon manufacturer to put that extra dart in the gun is absolutely amazing for the price.