Nisorin, Aralangs use weapons and tech for ranged combat, yes, but they also do melee combat as well.
For countering spells that were used against Abel, he wouldn't need to. He would just block them with his arm. He won't feel pain. They are just bones. Even if he does feel pain, I doubt he wouldn't need to worry, as he is indestructible. I doubt that even if it had nerves, his arm wouldn't feel a thing, as it's indestructible.
Research enemies? There are stories about monsters and beings that kill all, and there's no survivors... Where would the story come from, if there are no survivors? There would be nothing to research. All we would know is that people disappear without a trace. No bodies, no blood, nothing. We wouldn't know how it happened, we wouldn't know if the cause is either a machine or a person, or some deity. There could be witnesses to it happening, but I doubt they would be safe, if they would be near Abel. There would be the Archive with him, too.
If you would be able to punch someone, you would certainly be able to hold onto them. You would gain more distance with your fingers stretched out, than with a fist.