Trust me, if Starmer and Sunak attended ALL the debates you'd be absolutely sick of them more than you are now.
Firstly, I'm largely of the opinion that there are too many debates, I's be perfectly happy with none. Just like it always used to be by the way, they are a modern phenomenon from the last few elections
If they are as badly moderated as all of them have been so far then they are utterly pointless.
There are far better ways for parties to get their message across than these debates, not one of them has shifted public opinion much at all