Couldn't agree more. Most of life is just an absolute slog - school, college, stressful exams, trying to find a job, stressful interviews, then unless you are really lucky, working a mundane job for 40 plus years. Dragging your backside out of bed at the crack of dawn every morning. Dealing with your parents old age, and the upset of their eventual decline and death. Then you eventually get to retire and die yourself. And that's if you don't encounter various additional horrors along the way, like a cancer diagnosis etc. And for any child born now, that's all going to be played out alongside big financial pressures, possibly not being able to afford a home, having to work until age 70 plus.
I don't think it is selfish to want to spare anyone that. I wish I had been spared myself to be honest. I would never have chosen to be born. I would have stayed in my cosy state of non existence. I was perfectly happy like that for thousands upon thousands of years!