So not only PvP players get absolutely ignored by the current system, it takes way longer to gear as well.
Residuum could have been an amazing band aid to the gearing system for PvP players: Getting residuum through the PvP weekly cache would make the PvP community a lot less upset.
Just a bit of context: The PvP players are in uproar about gearing because blizzard removed and refuse to re-implement vendors. PvP players think arena/RBGs should be more about who has the most skill and who has the best strategy.
This is why in legion we had PvP templates. To put everyone on a equal level in PvP.
Blizzard team in BFA, not only removed PvP templates but they also nerfed PvP gear drops in rated PvP. Winning as much as a 50 3v3 will net you less gear than spamming mythic+ or clearing a raid even tho it takes more time.
Compare to PvE where when you enter an m+ or a raid, if you have more gear or a good strat or if you are playing easier difficulties, then you are pretty much guaranteed kills and thus loot; In PvP, there is no set strategy, the there is no set gear that will give you a victory and arenas or RBGs are never the same because you are not fighting AIs with timers.
Because of that gearing matters much more in PvP. When you enter a raid, not only you play the difficulty suited for your needs in gear and skill but also you have more chances of getting a guaranteed upgrade (you know what items drop from a boss, you can coin a specific boss etc).
In PvP, you queue for an arena and only get gear and rating if you win. Losing is much more punishing than in PvE because you lose rating that otherwise would award you better gear. You also fight people of different skill level. They might be better or worse but there’s no certain way of knowing compared to PvE.
It becomes really frustrating when you realise that your Weekly cache is also way worse compared to PvE m+. In m+, passing a +10 will grant you a the gear. You don’t even need to pass it on time. You will still get the gear associated to the key level in your chest.
In PvP, losing doesn’t progress your conquest bar. Having a higher rating is considerably more difficult than passing a +10 because not only you are not playing against AI, but you need to WIN against them. (class design matters a lot here too since some classes get hard countered by others)
PvP gearing is insanely RNG and no progres has been made to help this. Devs keep telling the community to diversify their activities but some rated 1600 shouldn’t have to PvE to have a shot at reaching 1800 or 2000 (the player would need to beat players significantly better than them which requires a lot of practice.)
Residuum would have been a good answer where getting some from your chest to be able to target high ilvl gear at the residuum vendor with the number increasing with rating like it increases with key level.
It would make PvP a lot less frustrating.
In PvE, there is always a winner. You can retry as much as you want and at one point you will get it. For your weekly cache, just trying and kill every boss not even on time will grant you gear.
In pvp, there is always a losing team. You fight random opponents, on random maps, and you get random gear that drops less than in PvE.
Let’s compare a team of 5 in a m+10 and a team of 3 in Arena PvP at 2000 rating. The m+ team cant kill the bosses in time and deplet the key. They still get the gear and go on with their day.
The team of 3 in arena loses a game: it doesn’t progress their conquest bar, they get no chance at any loot, it decrease their rating which might mean they get less valuable loot later on.
An absolutely awful scenario for the PvP group.
Residuum would go a long way to provide a band aid to fix this (get at least being able to target gear like PvErs without having to do content you might not enjoy).
TLDR: Put Residuum in the weekly PvP chest.