Blood rush was first an "Acolytes mods", it dropped first from Acolytes, which appeared temporary within their dedicated event. I'm well aware that nowadays it drop from Deimos, this is how I first got it, but firstly it dropped from that, which is what I was referencing.
Like the Acolytes Mods ! Even nowadays if you want to have them, you need to deal with Deimos' drop chance (or farm like a madman seven enemy for condition overload, most being once again on Deimos). Buying mods from the Steel Path store in comparison is a lot less work
But I get it, the problem is that you need to deal with Steel Path. . . Which is not the case anymore since they moved the mods to Arbitration. Which is one mission on the regular chart star but with some buff to specific equipment, and some drones you have to shoot from time to time (although the currency is more difficult to farm). . . So the problem is now void. (although I think they should put it in both).
Although, said grind can be resolved by buying them from players anyway.
I don't dread melee per say, but it's pretty fun without it. But there's no one who truly dread melee anyway, so even without the previous point, there's was no real problem with "the grind wall". You only had to do two or three missions with only melee to get the new mods, it's really nothing bad. (Compare to Berserker, which demand you to either do a lot of void fissure, or that you do a junction over an over again... 0,6% drop chance is not much. Although the sister may make it easier to get)
Here, I'm going to once again use your logic against you : it is ok to criticize a game you like, but look in the mirror and ask yourself if it's worth to criticize something that is fundamentally out of touch with the reality of the game you like.
You complain about a grind wall for the new mods, but the mods that were nerfed were ALSO behind a grind wall, one arguably worse due to them being on low drop chance rather than in a store. And if you try to tell me in the end there's no real "buff" to guns because it's only mods that changes, you also have to consider there's no "nerf" to melee because the only thing that changes is mods (excepts for Glaives' quick throw. But, you know, they're Glaives' quick throw...).
Basically you're trying to make a separation that isn't there. Both are behind grind walls, and the chance that you get Berserker or Condition Overload without grinding specifically for them is slim. And buying them from other players is something that so far, can also apply to the Galvanized mods (I see no reason for them to not be available for trading... but then again I see no reason with the Amalgam ones either. But since they never specified, I assume we will be able to trade them). And that whole argumentation can also apply to the Kuva Nukor (specifically for a melee primer).
That aside, I have no problem in agreeing that the mods were fine as is. But that in the end the nerfs will have little impact. (as you said : "melee stil go brrrr").
Good day to you as well.