Low level PLDs do have legitimate difficulty pre-tank stance. At 15 running Sastasha on my PLD I could barely keep up with the healer and dps using my enmity combo (pre-RoH). My gear was about as good as you can get at 15, mostly stuff that actually drops in that dungeon + HQ level appropriate gear. People saying enmity issues are just being undergeared must think you are only allowed to run dungeons once you have out leveled them.

That being said, I don't think this issue is related to the "nerf" as PLDs appeared to have the same problem pre-patch. Personally, I like the change to focus on Vit, I've always felt that it was weird for Str to be the focused stat on tanks. Feels like something unintended.