Apparently the argument I’ve been having isn’t about whether E&M fields can produce curvature or not. Rather the argument is about whether curvature is gravity (which, admittedly, is the standard interpretation but is not the interpretation I’ve used for the past decade). If so, there is no gravitational field, per se – it flat out doesn’t exist. There’s only curvature which can be interpreted as being gravity. But then the word “gravity” simply becomes a label and we end up with interpretational contradictions related to mass. In fact it verily begs for a redefinition of mass. Either way, it’s not a simple problem to be swept under the rug.