Soul charge
Damage eaters
LMC
Mana and Hit Point Regen
Luck
Those are properties that I use on all my shields for those kinds of characters. Might it be possible to max all those with legendary other pieces, could be but it gets particularly hard when you need to work in other artis for their special properties (like high luck or SDI).
Changing a piece of equipment that can be useful to so many different templates because 1 skill has a high dex requirement doesn't add up to me. And I don't think it simplifies anything.
This is the list for you Mervyn, was going to do it myself.
a. No I'm not already capped out on legendaries.
b. Shields can be crafted, and customised to fit your suit - Spellbooks cannot.
As you already know, offhands cannot be disarmed, main hands can, so if you had stats on a mainhand, you'd lose half your stats in a fight.
You keep one hand free for potions usage - so naturally this is the main hand normally.
The only time I use a Spellbook, is in pure PvM for the SDI, then I drop potion usage.
The big one - the list above didn't even mention
Soul Charge 30% - as a Pure Mage, I'm designed for casting, I want my mana regens - you don't get this on a mainhand/spellbook.
DCI can be overcapped to 20 on a shield.
Reactive Paralyse is possible on a shield - though granted more useful to parry mages.
The solution as I see it, and have been pushing for years - see my first post on Stratics in April - is to design an
Offhand Globe for Mages.
You can base the Offhand Globe on Intelligence, then swap shields over to Dex.
Mages get the Globe for the Stats, and it looks a whole lot better from an RP perspective - I don't like wearing a shield anyway, hated when they first brought in the requirement for a Mage to wear a shield for Stats - still do.
The Globe would have exactly all the Stats and capabilities of a Shield, just look better on a Mage, and can fit your proposal also.
I have got no issues you swapping Shields over to Dex, but you have to recognise you are nerfing Pure Mages again, and you have to have a fix for them.