It just feels insane to send them to the scrapyard when other operators are still operating much older units (e.g. northern with 323s, or scotrail with 318s and 320s). Scotrail would be unlikely due to the need for 3/6 car units, but that wouldn't be an issue with northern as they currently operate 4-car 319s and 3x23m 323s.
Yes, Northern has never operated electrostars before, but neither had they operated 319s or 195s or 331s etc. It feels insane to send the 12-y/o 379s to the scrap while northern continues to operate older worse non-air conditioned 28 y/o 323s, for many more years to come. Considering that they are hoping to end up with 34 3-car 323s, 30 4-car 379s might just work (and be a hell of a lot nicer for passengers).
Tbh, even the 37 class 350/2 would be nice for northern instead of 323s, and provide an upgrade for passengers over 323s, with air conditioning. Just much more modern.