Yes and amen.
Another reality is that TGC’s original purpose, in my estimation, makes them prone to reductionism in theology. Topics get sorted out into “gospel-issues” ™ and "not gospel-issues"™. The difference between the two is often arbitrary and subject to change depending on how the culture is currently reacting to Evangelicalism (i.e. our “witness to the world”).
I have a working theory that, in the same way that the Emergent Church movement of the mid 2000’s was a (over)reaction against Evangelical fundamentalism, the ethos of TGC is a similar reaction, but tempered by having seen the Emergents fly off into full-blown-heresey. The result is a need to maintain “conservative” bona fides while ceding as much ground as possible (on non-gospel-issiues™) to the culture.
Edit to add: Has anyone ever done a deep-dive into TGC’s founding documents? I remember some hullabaloo a year or so ago over some SocJus language in them. If I’m not mistaken, Keller pointed out that the same language has always been in there since TGC’s founding around 2005 or whenever. I think it would be very instructive in distilling Kellerite theology with the added benefit of seeing how it’s actually worked itself out over the past 15 years.