A 16:9 tablet won't display a webpage any more narrow than a 4:3 tablet with the same width. You just see more on the screen at a time. Same when the iPhone got a taller resolution. The homescreen wasn't any more cramped together. You just got an extra row of icons.
The key words there being "of the same width". Obviously the only way that a 16:9 tablet can have the same width as a 4:3 is if it is considerably taller and less portable. So basically you need a bigger tablet for a comparable web browsing experience. The 8.4" Galaxy Tab S, for example, has less width than the 7.9" iPad mini. I actually get more useful screen real estate for web browsing on the smaller tablet, in my opinion at least. It's no surprise that the Galaxy tab S2 went to 8" with a 4:3 ratio. For everything except videos, 4:3 gives you more for less.
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