Obi-Wan blames himself for Anakin turning into Vader and just can't bring himself to kill him, no matter how much damage Anakin does. Also, Anakin was the child of a prophecy, the one destined to destroy the Sith and bring Balance to the Force.
So you can either read it as weakness on Obi-Wan's part - he will beat the crap out of Vader but draw the line at executing him - or his devotion to believing in the Jedi prophecy - which Vader ultimately fulfills when he turns on Palpantine in 'Return of the Jedi'.
Apparently, Stuart Beattie (the writer whose film screenplay was used as the core of this streaming series) says his proposed film series would have explored Obi-Wan's rationale for sacrificing himself during his final battle with Vader.
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