I don’t think incumbents need a platform as guidance, at least not as badly as challengers do. I can look at the incumbent’s track record for guidance and judge them by their actions instead of cheap talk.
Similarily with challengers who have a long political career, for example Rick Scott v. Bill Nelson in the last election. The more of a history they have, the less I care about what they write and say for the campaign. Contrast with Andrew Gillum v. Ron DeSantis, both of whom had a comparatively shorter history in politics, so I relied more on their platforms, interviews, and the level of detail (or lack thereof) than with the Senate race.
~Max