Hours put in is completely pointless and an old win by unions to prevent companies from further exploitation of workers. If you can do 6x the work of the other devs on your team you have literally no obligation to work any harder.
The company does not have your interests at heart.
I don’t see how being honest makes this world a better place.
But I don't get this moralizing about cheating the company.
If you're feeling unmotivated and force yourself to work harder on something that doesn't motivate you to fulfill some kind of a moral standard, that might end up being a fast track to burnout. (Depending on the exact circumstances, your personality etc. of course, but burnout doesn't only happen because of too much work but also because of bad matches between people and their jobs.)
The key is to see if there's some way OP can find the motivation, and then work harder on getting more things done because they have the motivation to. Or to find some other kind of a solution to the unsatisfying situation.
I don't really get the moralizing about other people having to work in objectively worse conditions either. It's not like OP's (or anybody else's) mental well-being and satisfaction with something that doesn't appear to suit their personality should magically become better because someone else has bigger trouble.
He is being compensated (I infer) very well for a safe and comfortable job, except he doesn't like the tooling and he's realized that people trust him and he doesn't need to be honest to collect his paycheck.