Well, people in Traveller just seem to often do things the hard way.Wait. What? Are you telling me in a universe that has several star spanning civilizations, has mastered faster than light travel, has artificial and anti gravity, massive ship mounted energy weapons, that radioactives are still hard to mine, refine and transport? Ha. Ha, ha. Hahahahahahahahahahahaha! No. Just simply no. Rare? Sure, I’ll buy that. The rest? Please.
For example, at TL10+, there should be easily no need to ever do vacc-suited EVA. Yet there are people who mine asteroids by laser cutting them, then (semi)manually stuffing the chunks into their cargo bay.
I had always assumed it was just part of the setting and its charm. After all, it is based on 1970s sci-fi ideas that long since became retro.