Those don't really fall under "carrier maintenance" like mining Tritium specifically to ensure it does not lose functionality.
Additional to my above points.... "carrier maintenance" literally costs weekly credits.
CREDITS. Without paying the weekly maintenance fee not only does the carrier lose functionality... the cmdr loses the carrier!
Certainly moving a fleet carrier requires tritium.
Credits = Tritium. Particularly when filling a carrier with 20,000 units of tritium.
The fleet carrier has costs associated with running it. Similar to the buy-back costs of ships... if a cmdr is not yet comfortable with the costs (credits or tritium)... then they should really think about their choices.
If a cmdr is worried about "losing functionality" of their fleet carrier either because of credits or tritium, they really aren't ready for a multi-month deep space trip. If a cmdr knowingly embarks on a deep space journey that will leave them stranded far from human space...
too bad, so sad!
A big part of Elite Dangerous is learning to think ahead: plan and prepare. Whether designing ships for certain roles, figuring out good trade routes, powerplay strategies... etc. ED encourages players to think about their decisions for a better outcome later in the game.