What is wrong about the swords? Melian senses a darkness about them when she’s in their presence. Does she sense what deeds will be wrought with that sword? And they seem to be alive as Anglachel blunts when Beleg is killed, the sword speaks (depends on if we want it to be in Turin’s head or an actual voice others could hear), and breaks when Turin uses it to take his own life
"Melian looked at the blade; and she said: 'There is malice in this sword. The dark heart of the smith still dwells in it. It will not love the hand it serves; neither will it abide with you long.'"
The chief works of a creator can take after that creator, and considering this quote I wouldn't put it past Eol to even have inserted a little bit of his power into these two blades; but there's no need to figure out or explain the mechanics of that to the audience, at least at this point. Melian sees Beleg's end coming in some way, but what makes the swords special is Eol's "dark heart" dwelling in it. If the resulting malice and not-love actually shape our story of Turin and whether we make Anglachel an antagonist managing to get Beleg killed and encouraging Turin to kill himself is a question for another season down the road.
Regardless, it'd be prudent to at least give the story of the swords again, mention that they're special in terms of material and character - in my mind it'd work best with Eol showing off Anguirel to his dwarf friends, explaining how he made it from meteor iron and showing how well it can cut. They ask if he only made one, he grimly tells the tale of how he had to give Anglachel to Thingol. Maeglin stands by and says nothing, like he will do often. But his scheming and possessive nature shows when Maeglin steals Anguirel out of greed and takes it with him to Gondolin (maybe it comes up in future stories, like a Tuor-Turin connection?). At that point Aredhel gives a warning similar to Melian's, but more vague. Maeglin replies that the sword will serve Maeglin, Eol's son and prince of Gondolin.