A fine list, but does need an addendum the way FFG (and i think myself) think of using it. Since the reason Despy was on there in the first place is that it restricted console choices within faction you and FFG have different opinions on the matter. As such there should be a fifth point in your list:
5. Card greatly limiting options within a faction. Restricting diversity.
That said, you're coming from an understandable place to me regarding Desperado. The most healthy way would be a new card, or to errata this one. While i disagree it is the most interesting console currently, it was true for a long time (Gauntlet is really cool and effective) it is certainly among the ones that are very good for the game for the reasons you state.
I would not say that all the other consoles are bad, but that they have designed Criminal economy to synergise well with only desperado, and synergise very well indeed. This then is mostly about lack of alternatives to run-economy, or indeed Desperado synergising too well. A 'first time succesful run' or 'only on centrals' would go a long way on a card like desperado, making sure it being played in specifically run-economy-oriented Crims and not all Crims.
Maybe we'll see this in the rumored 'Core 2.0'. In any case the reason i want to MWL Desperado and you do not as i understand it is that you consider the criminal cardpool to be bad otherwise, and i think stuff like Temujin and others have brought it up a notch so that it can actually manage without Despy in all decks nowadays. Only time (and data) will show whose gut-feeling is correct. I can only say: give it a chance.
Regarding Caprice i think you are wrong however, not in that she is needed but in that she is the required power-level for corps to score out of remotes. Something on the level of Ash or Batty would do fine, Caprice is a notch above those two for sure. She is needed, however, since so few cards exist that fill this role, and this is one thing that FFG probably realizes but are saving their card-designs for her rotating.
The reason is likely that a deck that could use multiple powerful defensive upgrades would become too strong, but as soon as we get multiple lower-powered options glacier will likely be fine. Do you agree with this?
Caprice can be played around, she needs some skill to use, but she is a really weighted die in an otherwise balanced system. She is without a doubt (to me) too powerful. Not by much, but by enough. This is the reason i want to MWL her. She is also strong in a way that bypasses the game economy, and while i like that a lot for low-to-mid stakes, I do not like it for high-stakes. Turning the final agenda into a Yomi (or some would say die-roll) situation is not good design.
Thing is, since stakes are so high on those runs even the Yomi turns into more of a random game since the bet-amount matters very little to the gamestate. We all remember the RP-days, don't we?
Obviously seconding this post. On point Imo.