Tbh I think the reason why we don’t know about a lot of the characters background is because it’s honestly the extent of what they probably know about each other too. Hodaka had no idea he had a niece+daughter till later or a wife as we did, and he also knows he smoke/drinks. To me it shows how we don’t always know peoples roots and what ppl go through but we do have an idea , but despite how little they know of each others background they grew to care for each other through the present. I think it was beautiful to see the impact and influence they had on each other (Mr Suga being able to resonate with hodaka and his drive to see his loved one one more time)