This is a great point, which I completely share. Often it would be great to insert deep links into a particular section of a note. The workaround for me has been to try creating smaller (atomic) notes, but this sometimes has the downside of introducing a lot of fragmentation in the information.
Notion seems to implement this concept of "blocks" quite extensively, but it comes at the cost (IMHO) that notes become cumbersome aggregates of blocks, hard to manage and export as Markdown. I suppose another complication of deep-links, similar to back-links, would be how to keep them updated if the content of the pointed block changed.
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