Part of the reason on iOS it takes longer, at least in my vault set-up, to begin throwing in a new note is that Obsidian has to finish syncing and show me notifications (that I wish I could turn off) from a plug-in I value before I can begin navigating to a "new note" screen.
Not just for the speed, but also for (personal) mental simplicity, this is one of many reasons I use [Drafts](https://getdrafts.com) for so much writing. I also use a few other notes apps in concert with Obsidian, and if I just hit Drafts on my iPhone or Apple Watch I can start getting the idea down. If it's going to Obsidian, it's an action from Drafts to just dump it in there without using Obsidian's interface at all. If it's not going to Obsidian (and instead going to Bear or OmniFocus or into an email or a text message or appending to an existing note or a million other things) then it's just a different action.
Not just for the speed, but also for (personal) mental simplicity, this is one of many reasons I use [Drafts](https://getdrafts.com) for so much writing. I also use a few other notes apps in concert with Obsidian, and if I just hit Drafts on my iPhone or Apple Watch I can start getting the idea down. If it's going to Obsidian, it's an action from Drafts to just dump it in there without using Obsidian's interface at all. If it's not going to Obsidian (and instead going to Bear or OmniFocus or into an email or a text message or appending to an existing note or a million other things) then it's just a different action.