system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why don't more Jedi carry more then one lightsaber?

We see multiple times that they will purposefully go out of their way to grab another lightsaber in a dire fight, such as when another Jedi falls. So it is reasonable to assume that it gives them an advantage. There are also Jedi that do carry more lightsabers, so it isn't necessarily against their code or philosphy. So why not? It seems super useful, even if only for a emergency powerboost or as a back up when the lightsaber inevitably leaves their hands.
gpt
A) A lightsaber is an incredibly personal thing to a Jedi.  It's not something they (generally) just go to the store and buy off the shelf.  They build it themselves.  
B) Most aren't ambidextrous, or just not that good at fighting with two sabers so the advantage is minimal.  
C) "Leaving their hands" is not an issue most of the time as they can use the force to get it back.  
D) A lightsaber is not that difficult to activate with the force.  What happens if you are fighting a force user with your "emergency lighsaber" swinging from your hip?