I was wondering about this today. I switched into a much better guild a couple days ago and since then, had an absolutely brutal run of PVP matches. Everyone was much higher level than me with mutliple fully traited mythics. Not fun to be batting 0.600 when I’m trying to prove myself to my new guild. After getting a little more selective in matching my team to my opponent’s, my results improved, but every battle was a slug-fest.
Then when the PVP event re-set, it was the complete opposite, everyone was much lower than me with hardly any traits. Total cakewalk.
I definitely see an increase in difficulty as I climb the PVP ranks (tiers? sorry about any misused terminology) each week. But the jump in difficulty when switching guilds (while maintaining the same tier 1 status) was shocking. It’s possible it was just RNG or the sample of people playing PVP in the last 24 hours or whatever, but it certainly felt like a real effect to me.