Something I have always thought would be interesting in Traveller would be info on what it is like to be living as a future citizen - travelling on passenger ships, using planetary public transport grav buses/trams etc, being a tourist going on holiday trips around a star system, or going on long sight seeing holidays around a sector, stewards, food/drink, hotels, hotel lobbies, taxis, pubs and clubs, carousing and dating, gambling games and casinos, types of future sports events, housing, going to work, offices, shops and malls, the industrial sector, civilian robots, banks and money, gangs and criminals, police and law breaking, etc.
This sort of info could be useful in setting up the beginnings of an adventure set in the future and adding a lot of flesh onto the typical role playing setting.
A lot of great films start off with the mediocre/boring lives of the soon to be heroes .... Nobody being a perfect example, Star Wars being another ! The Judge Dredd comics often contrasted Dredds exploits fighting criminals with his home life and his robot servant Walter lol. Bladerunner 2049 is another good example of depicting the contrasting life of the main character.