Topic title is because mods love closing those, so no.
Why are there 1H tanking runeforges? Are they more meant for PVP? Because really, a parry chance increase doesn't seem great for PVP
Because you could dual-wield tank back in the days.
Blizz just haven't gotten around to it yet. Or.... Maybe they are still there because of pvp. I doubt it, but it COULD be the reason, despite having far superior runes already.
So that you can sneakily ignore the mods!
Just kidding. I'd say it's just one of those things they forgot to remove.
Regen#1804 need NA overwatch friends.
Actually, it's because of PVP, if you read the entire tooltip of the rune, the duration of disarm reduction is pretty much impossible to play without in high level PVP, so you keep a weapon with it on in your bags for when you're going to be disarmed, you can slap it on.
Because players whine when options are taken away, even if the option is utterly silly.
Although that said, taking options away is a bit pointless; since after all, it is just an option.