Any mission visiting would be in danger of perturbing the moon's orbit by shooting off from it, to go home, maybe? I wonder how space agencies would think about that.
I don't think that's a concern. The DART mission was able to alter the orbit of Dimorphos, but that asteroid is only 160 meters in diameter, much smaller than Deimos at 12.4km (mean diameter, it is oblong).
Mass wise, we're talking about Deimos at 1.5x10^15 kg, vs Dimorphos at 5x10^9 kg.
