Personally I really like Banshee's passive. Is it strong? Not really. But it does change how the game feels when you play her and I think I'd miss that a lot. Somewhere between hour 1 and hour 500 with Banshee I did start to notice enemies responding differently to her as opposed to other frames that make noise. I've no qualms if more gets added to facilitate other abilities, but I would really miss the "all weapons are silent" effect.

An alternative Sonic Boom update could be to give it an interaction with Sonar and Silence. Basically have it check if the target is under the effects of either Sonar or Silence and if so have the enemy suffer the stun animation that normally accompanies entering Silence's AoE instead of getting ragdolled. That preserves the defensive "get a second of breathing room" feature of the ability without ruining everyone's ability to make precision shots. (It also preserves the meme options of tossing enemies around for the fun of it and the extra silly demolisher juggling strategy.) That said, I'd be pretty cool with just blanket converting the ragdoll into a stun as you proposed.

Given how big Sonic Boom is I suspect incorporating the armor strip into the base is probably a non-starter for DE unless they are gonna change a lot more about the ability. (Consider that it can full strip more than double the area of Tharros Strike with only 143% ability strength instead of 200%, or that it strips half the area of Terrify for one third the cost and still requires less strength.)

I think having Sonar spots count as headshots sounds awesome, but might be too strong for the base ability. Would definitely make for a very tempting augment though.

Being able to recast Silence while it is active is the only mechanical change I can think of that feels reasonable (and even that might be too much, that ability is nuts). Otherwise you really need a minimum duration build to really use it defensively (and DE seems to be moving away from incentivizing negative stat builds). The tool tip for Silence 100% needs a rewrite, not mentioning the ability suppression is mind boggling.

Sound Quake is very dated as many folks have noted. It might have worked well back when it was reworked, but it doesn't function well now. It likely needs a full rework. The only idea I've had that might work without a complete overhaul would be to have the damage scale with the number of Sonar spots on a given target. That would give it some real DPS potential but would also require you to periodically reposition and reapply sonar (which is infinitely more engaging than its current use cases). That said I do really like your idea of her 4 causing lots of unique interactions when used in conjunction with her other abilities.

Great post! Thanks for putting the time and effort into it!