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1, Open in full screen on a 1080+ monitor. (720p monitor will not see any difference.)
2, Move your head forward and backward to the screen.
3, Under normal working distance, little to no difference could be seen.

Conclusion: Viewing distance determines the max resolution required!

Fine detail about screen resolution:
It's a gimmick to sell you something that you don't need. For a 14" laptop, under normal working distance between your eyes and the screen, you can't possibly see any pixel, so the extra resolution is wasted. Extra resolution means that the GPU would need to work harder, and so more energy is wasted. For my 768p 15" laptop, I can't see any pixel at normal working distance, so it's good enough for me, but since its resolution is very small, the UI for some applications is not scaled correctly. It's really not the issue of my screen resolution, but a badly created application. Similarly, a lot of the badly designed web sites have scaling problems on a lower resolution screen. The dummy designers are using a high end computer with high resolution, so everything appears too big on your lower resolution screen. It's not your problem. It's their problem. Most professional web sites still work fine on lower resolution screens. In case you encounter a badly designed page, use the zoom out function of the browser.

Most people don't understand this, nor do they understand how to fix it. Having a higher resolution is a curse especially when the scale for the application/web-page is badly designed. The solution is simple and unconscionable to most people: it's to reduce the screen resolution. For most of the applications with a lot of UI to scale properly, I need to reduce my screen resolution from 1920x1080 to 1600x900; and now everything display correctly, AKA, the front is not too small to see and the icon is not too small. The windows 10's own scaling doesn't work at all. It's garbage. Therefore the idea that you actually pay for a 2k screen for a small laptop is a very dumb idea.

To sum up, screen resolution is not the true cause of the scaling problem. Imagine there are two 720p monitors in 12" and 22". If the icon and text are designed for the 12" in a normal working distance of 20". The same icon and text would appear oversize viewed at the same 20" distance on the 22" screen, so resolution alone can't be used as the main design factor, and it actually very challenging to create a design that works flawless on different screen size and resolution. Reducing a 1080p 14" screen to 900p is not an ideal solution in the technical sense, but it's the ideal solution in a practical sense. The 14" screen can have any resolution, including 1080p, but since majority of these applications are badly scaled/designed, reducing the resolution will increase the text and icon size in a more correct proportional.