Gear doesn’t matter in random bgs. On my dh when I was 400 ilvl I was struggling at 1600 but I could go into a random bg in that gear and was almost always top kills and damage and won most my games. I remember beating a dhs mirror comp in 2s that had 350k health when I had 290k.
But yes gear does matter when you’re trying to push pass 1800 even to a top player like pikaboo on an alt class(especially in bfa where essences and traits make a huge difference). For randoms you’re fine going in at 380 ilvl as long as you help your team in some way, I’ve won many games with useful undergears and lost multiple games with useless 435-440 ilvl players.