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That would make sense if the candidates were strangers that were randomly chosen from the population but they have been in the public eye for years and the Tories had 14 years to show what they want to do.
Apparently most the public have no idea who Starmer is as a person, so he just had to appear competent. Turns out most people aren't in general election threads online and consume a couple of minutes of general news a day
In theory I think the purpose is to understand more about the candidates and interrogate their arguments and personalities.