Oh man the masters and layout proliferation is the biggest pain.

If you can, I'd do a bare bones starting template with like Cover, section divider, and title only layouts. Lock in slide dimensions, fonts, colors. Then ask (and pray) people upload that instead of letting Claude work from scratch.

Even if everyone goes in a different direction, it's much easier to merge and conform styles if you're working on the same template with minimal placeholders.

Ideally you get a library of "best practice" slides that people use as a starting point, but realistically people love doing their thing. Key is to set yourself up for an easy cleanup.