Agreed, YouTube shouldn't allow arbitrary re-upload. If they did, then 1) upload a popular song, 2) disable comments, 3) wait for it to get millions of views and tens of thousands of likes (https://www.youtube.com/watch?v=XycBLF6kWuY), 4) re-upload the video to now be a product pitch for your startup, 5) show potential investors how many millions of people are enthusiastic for your product.

And if one's reaction is, "re-uploading a video should reset all views and likes to zero", then re-uploading now has little advantage over making a new video.