I understand the technology limitations of the OT, but who's to say Yoda didnt have another saber tucked away in his shack? I think it would have been cool had there been a scene where he spars with Luke and teaching at the same time. I'd have to go along with the POV that both Yoda and the emperor didnt need sabers in the OT cuz they were beyond them in power. Obviously Sidious felt secure and was arrogant and overconfident in his throne room aboard the DSII, surrounded by Royal guards and troops and in control of Vader, knowing that he masterminded everything he sees. I dont regret either of them carrying sabers in the PT because of the turbulent circumstances at the time. The jedi were still a threat to Sidious as he grew in power. Yoda carried his to help defend the crumbling republic. I think Luca$ should have waited till ROTS for yoda's saber fight, and that being against Sidious. I believe Yoda and Sidious brandishing their lightsabers for the 1st time, against each other would have had more impact. Yoda should've defeated Dooku easily without the saber in AOTC, as I didnt care for that silly duel.