There are two kinds of video you need to think about.
* There's video that is original footage source material, like what the Mavic camera or a great DSLR can produce.
* There's video that is optimized for sharing and playback with all your final grading, sound, graphics, cuts, and other trimming completed.
In 2016, for 4K footage, unless you have quite a beefy machine, these two types of video will be very different. The first might be sluggish to view, laggy or frame-jumpy. There's just so much data in the raw footage that the average machine struggles to keep up.
In 2006, for 1080p footage, you had the same problem.
There's a third kind of video, actually. Most good video editors will make a temporary copy of the original footage source material, reduced in quality, designed for use while you're editing so you don't rage quit at dealing with all that lag. This is called proxy media. Then the editor will go back and process the original footage when rendering the final optimized output that you want to share.