Ion removed the final separation of PvP gear and PvE gear when he removed item level scaling and the PvP trinket bonus in Legion. His reasoning was he wanted “gear to be gear”. There is a Q and A from Legion where he touches on this. Essentially he wants the gear from PvE to be just as good in PvP and vice versa. It eliminates the barrier to entry for both forms of content by not having to farm a separate set of gear.
In theory this is great however it has some serious drawbacks.
The same issue still occurs. You still have preferred PvP stats, corruptions, traits, and items with special effects (think a tank trinket for a melee) and therefore still need a separate set of gear to be optimal in either form of content. This is no different than before.
PvE gear will always trump PvP gear in PvP. Since there is no “pvp stat” (a free stat added to PvP gear such as resilience or pvp power),no item level scaling, and no 2 PvP trinkets bonus (15% reduced damage taken in PvP) then PvE gear with special effects always beats PvP sourced gear. Items like trinkets and weapons/gear with special effects have no equal from PvP.
PvP gear acquisition has to change to match that of PvE gear as close as possible. This is why the PvP vendor was removed. It’s being brought back somewhat in Shadowlands selling inferior item level gear that can be upgraded based on your current rating via conquest. However this is nowhere near what it used to be in MoP and WoD where you can directly buy the best PvP gear regardless of your rating and be on a even playing field with everyone in PvP. This is important because in PvP any gear advantages should be non-existent or minimized as much as possible.
The attempt to remove the barrier for a PvP player who wants to participate in PvE content and the PvE player who wants to PvP is admirable, but it has failed. The barrier is still there. All this has achieved is to put PvP players at a disadvantage in their main form of content when facing PvE geared players and to frustrate the PvP player base with gearing acquisition changes.
Please go back to having separate PvP and PvE gear. There is a reason the original WoW devs designed it this way. They knew what they were doing and it was the best solution. There was no reason to change it and that’s more evident now than ever.