That’s more than 300g over the Arkose…
Sorry to be pedantic here, but the devil is in the details. Was the Tripster AT 1950g with axles, seat clamp, accesories, headset? You mentioned several times a weight range for the Arkoses around ~1650g (“from memory”), but again, was this with seat clamp, headset? Evans quote “2.68kg for a size medium and just under 3kg for a size large” for a 4 2017 frameset (ie. “450g [fork]”), and the math just doesn’t seem to add up.
A more precise weight comparison could well put the two frames within less than 150g of each other, making this a moot point.
I’m not trying to start an argument; I completely agree that riders’ needs (and preferences) vary and may trump objective features like price and weight.
This being said, the perfect Arkose for me would have a rear TA option and interchangeable cable guide plates (for 1x, mechanical and di2 options). And still in black. Yeah, I’d pay more for that.