Talking about useless skills, what would Woodcutting be without firemakeing? yea you could make a few bows in fletching, but that would really fast become useless too. While we are talking about useless skills, i think we should mention a few of the others ?
Agility: litterally the only use you have for this is if you wanna go at karamja agi post and gain the tickets.
And ofc climbing over a few obstacles, shouch as climbing over a wall for a shortcut in barb dung
Theiving: You can farm seeds, which is pretty useless if you dont wanna do farming (most seeds tho are obtained other ways)
Hunter: I remember lvling up hunter, i also remember the insane amount of dropping while catching those salamanders.
My point by saying this is, even tho skills might be boring and not having any proper use, their in the game and it makes the game better. i dont wanna see people be able to earn the max cape easier then it already is