So, what is special?
It is polish (=creator [4]). does that count? [0]
Seriously. For one thing, I spotted the "item" and "data" as queryable data sources [1]. if this is real "block level querying" (in that freeform page format), it could be indeed a missing link between obsidian and roam/logseq [0]. It is still early days though.
[0] Outside English-speaking/Western-Europe, Siuyan [2] is another local open source KB gem that successfully bridged this (blocks + freeform) gap with a very fast dev cycle. Being Chinese, It is not popular... wait.. what about logseq [3] ? (obsidian too? no.)
[1] https://silverbullet.md/%F0%9F%94%8C_Directive/Query
[2] https://github.com/siyuan-note/siyuan#-features