It completely depends on what you want to do with the information in the table. Yeah, it's marginally more strain on your eyeballs to track some 30 degrees acr

It completely depends on what you want to do with the information in the table. Yeah, it's marginally more strain on your eyeballs to track some 30 degrees across your field of view than glancing back and forth, but that only matters if you're reading every single value from left to right, row by row. It's extremely common to want to also compare values from top to bottom, column by column - or even just one particular column, known only to the reader. That's the whole point of a 2D table. It's one thing for an e-reader to have an option to flow longform text across multiple columns for that one guy with a 5120 x 2160 monitor who chooses to view the text in full-screen, another to apply "too wide is bad" everywhere. In particular, this looks stupidly blank in landscape mode on my 21:9 smartphone. Toggling Firefox to "Desktop Mode" shows it easily fits in that orientation.