is it worth reading Philidor’s Chess Analysis book?

I've started it a few times, but it's a bit of a slog getting through the verbose description of moves, for instance. It depends on what you want. If you just want chess instruction and analysis, there are easier instructional books published within the last two and a half centuries that also incorporate what has been learned since then. I'd say it may be analogous to reading Newton's Principia vs a modern physics textbook. (A la https://www.reddit.com/r/Physics/comments/1ed05kb/is_newtons_principia_still_worth_reading_for/). But you may want deeper background in some history and evolution of chess thought. For that, then it's better to go straight to the sources instead of relying someone else's paraphrasing.

Some chess.com bloggers on it:

https://www.chess.com/blog/simaginfan/philidor-a-game-ahead-of-its-time

https://www.chess.com/blog/kurtgodden/what-was-philidor-thinking

Thank you so much for your insight! It’s truly food for thought!