You don’t have time to have a kid before this surgery if it’s in January, and I don’t think either of you want this stress.
Best cast scenario, it’s not cancer, move forward however.
Worst case, you have to decide between terminating the pregnancy or removing the cancer.
And the inability to have biological children does not preclude you from becoming parents. Yes, it’s a much more complicated process to adopt/deal with surrogacy/etc. , but you’re not completely cutting off the option to raise a new generation.
This isn’t cultural, it’s a physical necessity of turning on a bike. If you were to just turn, you’d fall over. I seem to recall veritassium having an excellent video where they physically prevented the bike from countersteering to showcase.
People do it in cars for another reason; it gives you a wider turn angle.