There are several questions already asked on here about the potential for servicing the James Webb Space Telescope. This question asks what happens if the JWST needs repair. Basically, there are no plans to ever service the telescope because of its distance. To ensure robustness, engineers have planned for every eventuality they could imagine, and now we simply have to have faith in all of the engineers who worked on the telescope, and just hope it works perfectly (which seems to be the case as of now). This question explains that there may be a docking ring on JWST for possible future missions. This question is pretty much more of the same. Yes, JWST has a docking ring, but there are no plans to service it due to exorbitant costs. Finally, this question is just more of the same.
Now, none of the answers on these questions answers my question, which is, Is there something particularly difficult about servicing a mission at the Sun-Earth L2 point? Now, I understand that the L2 is good distance from Earth, about 1.5 million KM, but is distance the only thing making missions to the L2 difficult? I read in one of these questions that servicing JWST would be more difficult than achieving Low-Earth Orbit, but less difficult than landing on the moon, despite the moon being about 1/4 the distance to the L2. I am not 100% sure why that is, but I imagine it's because landing on another astronomical body and then relaunching to get off of that body are technological marvels, much more difficult than docking with a virtually gravity-less object. So, obviously, distance alone is not what dictates the difficulty of a mission.
So, my question, to belabor the point, is is there something specific about the L2 point, besides its distance, that makes servicing missions in that orbit especially difficult? For example, does the fact that it is an unstable Lagrange point make it more difficult than servicing a mission in a stable Lagrange point? Or are there dangers exclusive to L2 not found in other Lagrange points, or at least in other stable Lagrange points. Or, is this merely a case of the difficulty being it's distance from Earth?