I’ve tried this app a couple times and it’s impossible to overstate how important this feature is. I have to be blunt, especially with the issue unaddressed after this long, Obsidian is unusable to me if I can’t do such very basic navigation with the keyboard, and I’m sure many more people agree who don’t have the patience to make an account to complain.
Discord, another Electron app I also find useful for organizing knowledge by dumping stuff in my private server, lets you iterate through channels in a server’s channel hierarchy with with a simple ALT+Up/Down Arrow (my heavily preferred solution); Zim, another note taking app, lets you iterate through files / wiki pages in its hierarchy with ALT+PgUp/PgDn; there is no good reason why Obsidian should operate differently.