Go play another MMO, I haven't played em all but many of them when you toss an item you're screwed.
Did you learn to be more careful?
As has been stated by myself and others. Implementing this or even looking to it means dev time is being wasted on something that exists in the game to a degree and is 100% the players fault. And SE has come out saying that the dev team is small so there aren't a ton of people splitting up tasks. If FFXI was major bug free I wouldn't care.
Sadly it isn't there are major bugs in the game right now, and some of the they don't even have a clue how to fix. I'm sure they'll figure it out and it is sad that things were implemented without finding these bugs but figuring it out takes time. Time some people want wasted on even further hand holding features that most players won't care about because they're careful.
On top of bugs there are major features being worked on for new jobs, new expansion, old jobs, etc. All of these take time, and will add much, much more value to the player base as a whole than making items undroppable because some players are irresponsible and don't want to be more careful.