There's really no story here so the value probably was in making this a Disney+ series
Kudos to Disney. They've probably made the right call on deciding to retool this as a TV release.
I know we're only two episodes in but there are only six episodes in total, so I cannot imagine we're going to get an incredible jump in making any real addition to the Obi-Wan mythos.
I think this was always the concern even for those keen to see an Obi-Wan film. i.e. he's supposed to be on Tatooine watching over Luke. What could they do to make a compelling story? Well, episode two certainly didn't answer that.
Therefore by switching it to a streaming TV series, and ensuring a huge number of new subscribers, Disney probably pats itself of the back in terms of share price and banks more than it would have done with this story being delivered to cinemas. Poor word of mouth, based on this kind of story, probably would have seen this in Solo territory and done more harm to the franchise.
On Disney+ people will see this through to the end regardless of any disappointment thus far.