He [Trump] may want the appearance that he welcomes "sunlight," but it's doubtful he wants the actual sun shining on this courtroom for all to see. Trump and his lawyers know better than anyone that a televised trial would likely backfire on Trump in the 2024 presidential election by reminding voters that he's a lying, whining monster who tried to end our democracy as his last act in office.
Maga will never believe their eyes and ears about the lies and crimes Trump does. They want to believe the lies, like it is the Democrats that break the law, and the 2020 election was rigged, and Biden indicted Trump to stop him from running for president.
They get all their information from Trump and social media. And a little mental illness and dumb make the lie magic work.