Too bloody expensive to pay for lay-offs. Far cheaper to make people miserable so they leave on their own. (ahem, "organic" attribution.
It's about $$$$.
Back in the layoff days (late 90s/early 2000s), managers used to have to keep force ranked lists of those they would cut if asked by Management to reduce headcount expense.
It was very open, everyone knew. Managers would announce in team meetings they were looking at possible cuts ("more details to come") They would have their own short list + you could go up to your manager and say, "hey, if you're asked to make cuts, I wouldn't mind" or "Put me on the list. If i can help save the seat of someone who really needs the job, happy to help). I tried for YEARS, but was always told "no, not you". :-(
Now the ones they'd let go have been here so long, it would cost them an arm and a leg + the dreaded bad press (good lord, not THAT!!). So the strategy is make people miserable and they will sort themslves out.
Personally, I would LOVE to be laid off as a bridge to retirement!! That would be beautiful - then, I really would be grateful.