A couple of comments…
Graphics:
TIFF files support transparency too. PNG files only support RGB and Grayscale; if you need CMYK or Black-only line art, use PSD or TIFF.
Sync. Styles:
It would make sense that it would not sync deletions. How would ID know if it was a deletion vs. a style that is unique to a single document? HOWEVER, I could see a Global Style Rename or Delete function being very handy.
TOC:
I’ve never had a problem with the TOC, even for bilingual (two TOCs) and 1000-page books. The error is usually in the style management/naming between documents.
Stories:
I’ve had (by necessity) documents that were over 350 pages as part of a larger book. The documents were slow to respond, but that was because of the linked graphics. As I test, I removed the graphics and the files were very “spiffy” when navigating and editing. Since it is greatly dependent on computer setup, one’s mileage may vary.
One should also mention the availability of Adobe FrameMaker. While it formatting is basic compared to InDesign, its long-document features exceed InDesign’s, especially the Book panel.
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