You actually inspired me to make a quick change. Based on your note about photos and media, I just ungated the platform. I previously had a text Pieces only flag active, but I've turned it off. You can now attach images, video, audio, and docs to a Piece; not just text.
As for your other points:
Time-limits for release: This is a super interesting idea. If people find it useful, I think it could fit into Pieces.
Tipping vs. Funding: The investigative journalist or artist scenario is exactly the shape that Pieces is built for ("fund the unlock"). While voluntary post-release tips are great, they don't fully solve the free-rider problem that Pieces aims to address via dominant assurance contracts. Platforms like BuyMeACoffee handle tips well, but Pieces is laser-focused on the pre-release funding stage.
Good luck with your projects as well! What are you currently working on?