Big use case that makes me appreciate tx accelerators like Mempool:

Geographically distributed multisig transactions during fee spikes!

Imagine you go to your final location, a week later, and fees spike like crazy 😭

RBF/CPFP is not an option: going back to those n locations for re-applying signatures is infeasible

Accelerators fix this! Wdyt? Am I highly regarded? (don't answer this)