I can’t speak to Trump’s rationale, but know of at least one instance where a MOAB was substituted for the normal ordinance in theatre because it was approaching it service rated shelf life.
Explosive ordinance has a shelf life, and once they’re expired, they either need to be taken out of supply for servicing, or dismantled and disposed of.
No… It risks either not going boom, or some other catastrophic failure like we saw in the early days of the Ukraine war with the S300 and S400 missiles that would U-turn after launch and hit their own launcher, most likely from being improperly stored, not maintained, and/or outside of their rated service life.