It's an interesting idea but missing vital features for me. For example, the star in Chrome tells me that I have bookmarked this page in the past so I avoid having duplicate bookmarks even after editing the name. The standard synchronization also makes it easy to bookmark a link on my phone and then deal with it once I'm back at my computer. Now I would have to figure out a way to somehow download the URL as a file on my phone so it syncs to my computer. The favicon is another neat thing to have on bookmarks.
Somewhere along the way it just feels like a backup makes more sense.
It's probably tied to how I use bookmarks but I strive for quality over quantity. Some are just temporary until I get the chance to write down the important information or watch the video - others are more constant, but when I go through and purge bookmarks I want them gone. They will just clutter my bookmarks, waste time and make it difficult to find things. In your example about bookmarking the question I would instead transcribe the knowledge to Obsidian and link to the source.
Not saying there's a right or wrong. Just down to how people treat bookmarks.
Somewhere along the way it just feels like a backup makes more sense.