* Use a few bullet points to put attention on the main points you want to convey.
* Without going overboard, use a tasteful amount of graphic design (bolding one key sentence or whatever).
* Break up a giant nuanced email into sections.
* If something is critical, make it visual: a picture, explainer video, or an infographic can be really useful for something key.
This is harder than it looks. A quote attributed to Mark Twain is "I didn't have time to write a short letter, so I wrote a long one instead." It's a lot easier to go overboard than to distill what needs to be conveyed into the core elements.
Hell, I've learned not to ask more than one question in an email. The first one is the only one to get answered.
For me, I tend to 'jump' to the first answer that comes to mind, without reading the full nuance, likely because I'm optimizing at replying sooner, so I can move onto the next task, because I have many tasks I need to do. I quickly pattern match and move on.
imagine times where you replied to emails partially
It will be hard for someone that always replies to the first thing only to empathize with this but: This has literally never happened to me. As in, I have never replied partially to something in an email. You will get an answer to each of your items. Granted, you may not get the answer you were looking for but I will answer each and every one, even if it's just a "I will have to look into this one and get back to you" so that the other 6 items can get answered right away.Why do the thorough people always have to empathize and not the other way around?
I also never said that I will answer your questions right away. Just that I will answer all 7 of them once I do reply. The opportunity cost of looking at my email inbox might be way too high at a particular moment and so I might not even see your message for a full day to begin with. Same w/ a slack message. I might not see your particular message for some time or I might see it and decide that it's not a message I can deal with on the side while in a meeting and mark it for later consumption e.g. for when the meeting ends early etc.
FWIW I've so far never seen anyone try to 'use' my thoroughness to create a denial of service attack against me. If that ever did happen, I would definitely change my stance. But it won't be to answer the first question each time. It would be to stop talking to them. Like I ignore any "Hi, can I ask you a question?" messages. Even some directors have tried that and just gotten ignored (first time someone does it, I will let them know they can just ask away. Second time they get ignored until they learn).