I tried to put my tasks all in Obsidian, but I eventually moved to Apple Reminders. Reminders sends me notifications about the task. Maybe Obsidian can, too, with a plug-in, but I don’t want to fuss with that. I also had problems entering a task in Obsidian on my computer and then having it show up on my phone quickly or vice versa, whereas (because I have both an iPhone and Mac) this is not a problem with Apple Reminders. Again, may be solvable with a plug-in but I don’t particularly feel like looking for a plug-in for something like this, no matter how irrational that feeling is.
Last time I checked, Reminders doesn’t have markdown support, and I’m not even sure if it lets me make line breaks. Not great for tasks that I need to write lots of detail about. But those tasks are usually far and few between, because I tend to write down the immediate next step to big tasks instead of writing down the big task and all the details I have to know about it.