Jacks are not genetically damaged, where do people get this nonsense. There are various theories as to why salmon "jack' but it is believed they may be the fish that are doing the best and get to a certain size threshold and there is genetic expression that causes them to mature and to spawn early. As far as hatchery smolts go they are very well fed, and are typically bigger than wild smolts who have to try and survive the winter on whatever food happens to come along. While many wild smolts do not survive, something like 90% of the hatchery ones do, they are bigger and are all released just as the wild survivors make their way to the estuary. They then have to compete with larger hatchery smolts, who have been released in a huge pulse. Its not as simple as selecting the biggest fish. Hatcheries have many more issues than that, and even systems with large fish returning also have 4 year olds. We have no idea how growth rates , ocean conditions or other factors effect gene expression Hatcheries never choose jacks but hatchery rivers still have jacks, and at a much higher rate than natural rivers, the Columbia now has years where the returning jacks outnumber mature males. Hatchery deleterious effects on the gene pool are well studied. If you domesticate the river with a hatchery, the wild fish eventually become extinct.
Roderick Haig brown was a conservation visionary who foresaw the "easy" rehabilitation of fish stocks with technology (hatcheries) for the folly it has been proven to be. Despite all the evidence most fisherman still think of hatcheries as a way of preserving fish stocks. It has become obvious they are not. Certainly the facility on the Wonnock just proves we don't learn, always want easy fixes, and this hatchery will prove to be just as harmful, pushed and funded by special interests such a Duncanby Lodge and others. If you want to read a brief overview of the ills of hatcheries below is a link.
https://thetyee.ca/Opinion/2016/12/21/Fish-Hatcheries-Warning/