The benefit depends on what part of the system I decide to optimize. If I guess right (and enhance something impacted by many/big requirements in the future) I

The benefit depends on what part of the system I decide to optimize. If I guess right (and enhance something impacted by many/big requirements in the future) I will reap good results. If I enhance something which stays basically untouched for the rest of the FY I will be considered a fraud or misguided. Applications developed internally don't necessarily have a roadmap (or might have it and abandon it 2 weeks into the new year because). Problem is, nobody will consider you a hero for sticking to the (now obsolete) plan.