In play, I don't see dropped weapons becoming narrative tools because of their frequency. Literally every combat I've played in has seen people dropping weapons when they want to switch. That's no longer a narratively interesting thing to have happen. I can take any crappy system and use creativity to make it mean something. That doesn't mean the system can't be improved. I'll ask again, to everyone, what is your actual play experience with players dropping weapons?
My actual experience with players dropping weapons is that it's entirely a non-issue. Your problem with your players dropping items is likely more a facet of your players' personal gaming culture than it is a fault in the game system.
The ready action has never been a problem at my table. PCs dropping items has never been an issue at my table either, it usually means that they are in a serious hurry for a narrative reason and it actually makes sense from an RP standpoint. If the devs really have the time to devote to such tedium, I'd suggest that the rule be rewritten to allow PCs to stow a weapon as part of a ready action to draw another weapon. In my experience this sort of thing should be left to house-ruling and is hardly evidence of poor game design.
Before you decide to browbeat me for disagreeing with you, Nimsim, consider that you started this discussion for a reason. If you didn't wish to discuss it, if you just wanted to hear your own ideas echoed back at you, you shouldn't have posted on the forums.