shield is considered armor therefore it shouldn't You can't get additional AC from the same source, but these are different sources. Shields, Shield, and Mage armor do all stack https://www.sageadvice.eu/2015/08/10/mundane-shield-and-mage-armor/
What is the problem you are solving? Does your proposed change solve the problem? Is your change feasible? What else will be affected by your change? Will your change impact revenue? Does your change align with the goals and strategies of the organizations (Larian, WotC)?
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