I didn't say I had a problem with Sera not interacting with her Red Jenny spies, I have a problem with her never being shown to interact with the poor that she claims to care so much about.
She's constantly lecturing the Inquisitor against considering themselves so big and important that they don't notice or care about the "little folk" working for them, yet she's never shown actually interacting with, getting to know, or helping out Inquisiton staff either. If anything, she has her own private room in the tavern that she never seems to leave (while Bull hangs out with common tavern patrons downstairs), and we're only told about her causing problems for Inquisition staff too, like how she steals tons of jam from the kitchens and drives the cooks crazy. I guess the cook and cook's assistants don't count as "little people" one shouldn't cause problems for.
It's a huge part of Bull's character that he's friendly, sociable, and cares about the men under him, so we have scenes that show him caring about and getting to know his men. We're constantly told Sera cares about the poor folk, yet apart from one scene where she talks to elven servants in the Winter Palace we have NO scenes of her actually interacting with them or making their days better with her antics.
Even the prank scene falls flat because she CLAIMS it's to boost morale, but we never actually see the Inquisition's common getting a laugh through her antics. It just comes across as Sera wanting to play pranks because she feels like playing pranks on "big, important people," then using common folk as an excuse to do it.
I'll also address people who jumped on me for condemning Sera for appointing herself as Judge, Jury, and Executioner to all "important folk" she feels doesn't treat the common folk right: I stand by it. Sera has shown that she's willing to murder nobles she just met and knows nothing about based on hearsay and rumor, and based on whether or not she likes them on sight. I used her double standard regarding mages as an example of her having a very warped and biased perspective. Lots of people jumped on me for being biased. You're right, I am biased. But unlike Sera, I don't take it upon myself to go around playing Judge, Jury, and Executioner to a bunch of people I don't know based on whether or not they fit my personal biased view of what proper conduct to other people is. I still don't respect or like Sera for personally appointing herself the ultimate judge of the fates of nobles; and I don't even like nobles!
As I said, this is a problem with Inquisition as a whole. If Inquisition had quest structure and general game design inspired by Origins and not Skyrim then we might actually have more of that meaningful interaction that you're talking about. Compare what we saw of the cultures of Thedas in Origins and what we saw in inquisition.
Also, with your 'judge, jury, executioner' point - you have the benefit of living in a democracy where governments are democratically elected and therefore accountable - in a world like that, Sera's actions are reprehensible. However, in a world where she is a second class citizen among second class citizens, where she's seen the atrocities the system allows, where she's seen the immense disparity and privilege the nobles benefit from, and when there is no way to enact change fairly within the systems of government, then in that regard her actions are not nearly as terrible - even if neither me nor my inquisitor condones them..
By your logic, the French revolution was evil. Sure, it wasn't perfect, but it was better than what came before.
Or, in another way, the judges, juries and executioners of Dragon Age's feudal world are not forces of social justice but forces which entrench privilege and social injustice. Take a look at Halamshiral is you want to see the kind of social justice that the ultimate judge - the Empress - decides upon.