How does this related to "AI"?
The joke is that this tool is compelling enough that people might die from it.
AHAHAHAHAHAH oh man
Graph approach can be extended to entire web browsing. From page A, you open page B, but you also open page B, from page C. Tree-style browsing will result in opening/seeing page B twice and also not (easily) seeing that came to B from both A and C.
A bit more seriously, it can be really useful to have a graph of ArXiv tabs instead of a linear range of tabs, this can be very handy when doing a dive in scientific literature.