I agree that having kids can be awesome, but the idea it’s foolish to see it as a waste of time is shitty as well. OP is perfectly reasonable to find it terrible, because for many people, it is. People are less happy after having children on average, as alien and counterintuitive as it may seem to you. It’s a spectrum, with many people actually being happier, or at least more content with their life after. However, many people don’t.

The problem is that people make the mistake of seeing children as a means rather than an end. If they knew the truth, that raising children is the end goal for a parent rather than a step to something else, they wouldn’t want to do it. Those people shouldn’t be mislead. If you won’t get satisfaction out of nurturing your kid, it’s better for both you and your potential offspring that you live your own life. The kid might grow up and love life, but both of you will suffer for it.

Someone else, someone who really wants to change diapers and deal with tantrums to see a human grow, can raise the next generation just fine. If you want to pass on genes or whatever, but see no purpose beyond that, then have someone adopt them and be on your way. It’d be a win-win for us both.