Because some of us have parents and family members who cannot fly to come see us?
How selfish and entitled can you be not to consider other reasons and then talk about the children not remembering, the family does who finally gets to see them.
My father couldn’t fly when my first was born because he medically couldn’t at the time. He nearly died while I was pregnant.
People are pretty negative when couples have grandparents wait to meet their children, imagine not meeting a grandchild for years because people like yourself think you’re entitled to a silent flight.
If I did as you thought, he wouldn’t have met DS1 until he was four which was when he was finally able to travel to us. I took DS1 business class because it had much more space for him to move around, he was on the verge of walking vs him trying to move around with someone right next to us. He was quiet the entire time even during take offs and landings because I made sure to nurse him to help with the pressure change.
Do like the rest of us who travel and wear headphones/earphones! Take something that has you sleep the entire flight so you don’t hear the noise.
At the end of the day, a flight is public transport, the parents are paying way more than you for your flight alone and you are not guaranteed silence from adults and/or children. I’d take the baby crying who can’t help it than the loud talkers and drunk adults who could actually keep their voice down and limit their drinking.