Just because you don't understand it doesn't mean it's stupid
I'll explain some more. Sometimes I need to leave the house and don't come back for one or two days. If I would do this with the sleep option, I would come back to an empty battery. Then I would have to recharge it again before I can take it out of the house. Not an option for me.
In addition, having less cycles is good for resale value, I've experienced in the past.
Then there's the issue that frequent discharging to 95% and then topping up to 100% is not good practice for notebook batteries. To counter this effect one would have to make deeper cycles, which would lead to even more battery cycles.
I've got a feeling you're going to try to question my motives again

I kindly request you not to, and let me have my preferences. I know my preferences and they come from a valid background, even though you might not understand it.
PS. What I think is "stupid" is that a $199 netbook can do this and my $1200 MBP can't.