I've been looking into all sorts of them recently: logseq, appflowy, vikunja, etc. What tools do you use? Why? What problems did you run into with the previous set of tools you used for this job?
Right now I'm primarily interested in finding a "zero-knowledge" (cloud provider doesn't have access to my data) system for task management. Needs to be able to have recurring tasks and tasks organized in some interesting/useful ways (by projects/labels/something, maybe a kanban and table view). Deadlines and time tracking/planning interesting but not required.
Obsidian thankfully has many of the same features that you're describing, albeit some of them rely on community plugins. The cross platform accessibility of markdown is definitely the biggest factor for a lot of people - but for me, the fact that I can instantly make an aesthetically pleasing note; one that is not just easy to read and gather information from but is also nice to look at: is the biggest plus. Other editors have plenty of templates and most people probably don't care about how their notes look as long as it's notes, but I love the look and feel of a good markdown note