Do you think humans will be able to genetically engineer future humans in your life time?
do you think humans should be engineering human dna?
are there some events when we should? when we should not?

Yes, they could, but they shouldn't because there can be many mistakes. There are some such as if we want someone to be immune to some diseases. But we shouldn't if it's a situation that we want someone more beautiful!

pregnancy happens more and more

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.