Goodaltgamer: Sorry, but even the link you provided tells me, that my memory is right, Doom might have been an exception, but otherwise 4:3.
I used 4:3 for over 2/3 of my live;)
Let´s have a look at the standard resolutions at their time:
https://en.wikipedia.org/wiki/Computer_display_standard Especially if you start looking for Hercules and CGA onwards, all 4:3
And I don´t see the OP talking about anything else.....
All the old games were programmed to be played on 4:3, best example SVGA.....also for old gamers the VESA standard......
Most games afterwards stayed with this standard.....
You either misread or misunderstood the article I linked to. I didn't say the games weren't meant for 4:3, just that they used non-square pixels. You should try doing a little maths to understand. The resolution most commonly used by the games we're talking about was 320x200, those numbers doesn't have a ratio of 4:3 in terms of pixels, but rather 8:5. Don't get me wrong - the game was meant to be displayed at 4:3 but with 'tall' non-square pixels.
Read the Doom article again, it explains the matter perfectly. The standard game resolution back then was 320x200, the 'aspect ratio' option in both DOSBox and ScummVM is for correcting this discrepancy, it's nothing to do with whether you're using a 16:9 monitor or a 4:3 monitor.
I'll give you the benefit of the doubt and put the misunderstanding down to poor explanation on my part.