I think you might be barking uptime wrong tree here. 25 years ago I was doing 4 sectors or even 6 sectors on a 6 on 3 off roster at Easy. You think you're better than the crews of 25 years ago? Newsflash: You're not, you're just the same. It was a struggle then and it's a struggle now. Stop trying to make out you're better, you're not.
Nobody is 'trained' to deal with fatigue, It just happens due to crap rostering. At least these days crews mostly get a rest day after a deep late. 25 years ago I was back at work 12 hours later. I lasted 4 years at Easy, it was crap. Enjoy your struggle.
You have no idea what was happening 20-25 years ago clearly. Typical.