I'm currently studying anf there's another woman in my class who is utterly useless and does fuck all. She tries to cling onto other people's coat tails and have them spoon feed her. She has absolutely no clue about anything.
The tories are the same. They have no idea how to fix anything. Starmer knows this, that's why he's giving nothing away. He knows they want his solutions so that they can spin them as their own. He's giving them space to hoist themselves with their own petard.
As PP says, if they want him to properly set out his plans, call an election. Until then enjoy stewing in your own juices.