Indeed! Even assuming I'm somewhat better than typical, condoms make me a bit nervous.
Good for you. They should make everybody nervous!
But any unit more than a year doesn't make much sense.
It would be more accurate to reality, and would aid people in family planning. What about this does not make sense?
I suppose, like, five or ten years might make sense. But it seems to me that the length of people's sex lives and time of usage of different birth control methods vary enough that even that could be overkill. Like, if you try out a method for a few months to a year, the 5-year prognosis won't necessarily be relevant to you. Although I suppose you wouldn't necessarily plan to use a method for less than 5 years, in which case, that's what would be relevant to your decision making, even if you don't end up using it for that long.
P/S/A: There are single sentences which can create life-changing amounts of difference.