That said, after the novelty wares of, it wouldn't feel like a slight push to do something new - it'd simply be another required assembly line of doing near identical things with different materials. Minimizing the number of assembly lines required, I feel, is a good thing.
Additionally, if boredom or a variant thereof is added to the game, I would hope it be made a reward as opposed to punishment. Even if they're mechanically the same, getting 200% of 100 feels better than getting 50% of 400... But perhaps I'm getting off topic
