Perhaps another way to phrase a similar thought.
You’re probably right, ones life, and the world for that matter, could be different in ways that would be better. And this fact certainly deserves some amount of mourning. Especially things that seems to be just within reach.
But then again, if we take that thought to it’s extreme there’s no end to it, how different can we which for before being unreasonable? My goto example being that I wasn’t born with wings, and yes sometimes this fact saddens me, but overall not to an extent that it takes away my happiness for everything in my life I’m thankful of. Flying would be nice, but so is spending an evening dining with family, and this I can do (a fact I’m grateful of, not everyone is so lucky).
Perhaps it would be better to be born in another era, say a thousand years from now? A million? And yet, this place and time is probably so much better than many others I could have been born in. Would I be happier if I didn’t need oxygen? Eternal life? Perhaps. But why bother thinking about it The die has been cast, the rules of the game has been selected, I might as well enjoy it while playing.