The project itself?
or the file nodes?
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In both cases one answer is the file node, it’s not licensed to just share ( megascans asset) you can just replace this with anything mind, or get the megascans asset, but if it were shipped without the file or a different one, then someone follwoing step by step woudl still be confused and just not understand.
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Another could be for tutorials like this ( step mby step) some of the goals are to make a users step by step themselves to understand why and apply the ideas themselves ( a learning process)
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Finally it may be something the team want to refine to add to the examples
There could be even more reasons but these are a few logical ones.
[!note]
Here is the Original File Node input
In cases where Maarten has shared files and deep learning.
Check out out his post here and his latest starter guide on YT
Hope that helps