Many a times, while writing in Obsidian, I have felt a need to reference a particular block of words in that line. Having this feature would indeed be devine.
However, “how would this addition play with other things ?” I wonder . And, there is still the fact of block referencing not being a standard feature across PKM mediums. Roam and Obisidan handle block referencing in separate ways. Keeping this in mind, I try to avoid using block referencing as sparsely as possible. Avoid it altogether, if I can.