You mean Most Important Tasks as per Zen to Done? I do not use those, not formally, but I do "behave" similarly without giving it much thought. I use an app with a starring/focusing feature, and, yes, I do star some tasks every morning, and yes, some of those are important or urgent etc. They all relate to my goals.
I don't think you have a problem. Yo do not need to follow any of this to the letter. If you pick (or "star") three quick phone calls, there is no problem. You could also pick more straight away (and un-mark them if you have a drastic change of energy etc), or pick more later in in the day when you know what energy etc you have right then.