That Flash is enough for a moderate protocol stack plus application logic — think sensor fusion, motor control, or a fieldbus node — while the RAM handles a couple of large buffers without spilling into external memory. The 87 I/O pins in the 100-LQFP package give you room for parallel LCD interfaces, multiple UARTs, and a bank of GPIOs without muxing conflicts.
Supply range and temperature — where it runs
Peripherals and connectivity — what the bus carries
DMA moves data between peripherals and RAM without CPU intervention, which matters when you're running the ADC at full rate and still need to service the protocol stack.
Lifecycle — no LTB surprise for production
For dual-source planning, the MSP430F5xx family includes pin-compatible density variants — stepping up or down in Flash/RAM without a board spin is possible within the same footprint.