I'd love to use Obsidian to store notes, mostly for the note graph, but it's missing aliases[0].
Tables can be done with Markdown anyway (with a plugin to make it easier), there is a Calendar plugin, IIRC timelines are in development, though you can already do Gantt charts with Mermaid.
It depends what exactly you want, but right now it's mainly static Markdown with features like templates, bidirectional linking, etc. but community-developed plugins and new features will likely quickly enable the features you need. I have been using Obsidian for a few weeks and it's been quite nice :)
You can configure views, filtering, sorting, summary’s, and foreign keys with roll ups....
That’s not something trivial to build, however I’d be pleasantly surprised if obsidian eventually got there.