MLO really needs instant sync IMO. I had to move to another productivity app due to needing instant sync with Google Calendar. I was just becoming too frustrated with having to click that calendar sync button whenever I wanted to see changes on my calendar and then even at that, only being able to do so at my desktop. How limiting. Besides, I don't think calendar sync is being utilized by a lot of users because it would get a lot more attention. It's missing from the mobile apps altogether with no stated plans of adding this. I'm mobile, not solely a desktop user only.
I also had the problem of getting reminders from MLO on my Android when those tasks were already completed earlier on my desktop. In order to get those tasks to sync and go away on my phone, I have to open MLO on my phone. After I complete tasks on my desktop app, I don't want to get reminders for those tasks coming from my phone. MLO needs instant sync for those two reasons. People are mobile today. If you're going to add calendar sync, it needs to be instant and you need it on the mobile apps. Calendar sync shouldn't have even been considered without those two things IMO.
Joel