We’re living in the very best time to be human so far. It wasn’t long ago that the world was living under the constant threat of global nuclear annihilation, before that two world wars, before that constant illness, famines, and other wars, etc. Long before that, just struggling to get enough food and shelter to survive.
The same goes for current working conditions/life. Some things are worse than 20 years ago but some are better.
For one thing, micro-plastics weren't in the brains and bloodstream of past populations. That said, doubtful anyone hesitant to have kids is under the delusion everything was always better in the past. I certainly wasn't when the time came to make those decisions.
Who is saying this?!
Regardless, there are 8 billion humans from a population pool that may have at times dropped to as few as a few hundred. So risk of human extinction is far less than the (very real) risk of making lives of future generations much shittier.