Smartphone screens have been growing for years now, but recently they started growing in only one dimension - height. This led to taller and taller aspect ratios that redefined how large a 6" screen is. Here's a comparison: a 6" 18:9 screen is essentially a 5.5" 16:9 screen with an extra row on top (1.5cm or half an inch taller). This is largely because wide phones are uncomfortable to hold. But tall phones are not easy to use either, reaching elements on the top of the screen gets trickier with every added inch. A well-designed user interface can alleviate this to some extent by...
Source: https://www.gsmarena.com/weekly_poll_whats_the_ideal_screen_size-news-34934.php
