Am I misunderstanding what pull cords are, or why not have it so the two strings can separate easily? The two strings in my blinds “snap” together so that it’s easy to raise/lower the blinds, but the strings separate very easily from each other if applying force in any other kind of way (would be impossible for a child to accidently hang themselves with it for example)
I think that the magnetic thing sits constantly in the port, so there’s no risk the charging port gets filled with pocket lint.