In MS-DOS 5.0 and later at least you could make a menu at start-up to pick what to activate. I looked at my old config.sys and autoexec.bat recently and it was

In MS-DOS 5.0 and later at least you could make a menu at start-up to pick what to activate. I looked at my old config.sys and autoexec.bat recently and it was amazingly simple. 100% of system configuration in maybe 1-200 lines of text, in two files. Not so bad compared to hunting for were to configure something in any modern OS? DOS did what it had to do. For coding you could start up emacs (and ctrl-z somehow magically could drop you in a command.com shell that you could exit from to go back to emacs; I think there was a DOS interrupt to allow applications to start sub-shells like that?). And otherwise (i.e. most of the time for most of us) you just booted and started a game and then when you were done playing turned off the computer. Anyway I must admit, many years later, that many games (and some applications) around 1990 were definitely better on an Amiga. DOS games for some time were rarely the best ports. But I never used an Amiga enough to learn if I liked the operating system much. I did buy Amiga Forever some year ago and that comes with a few pre-configured disk images with AmigaOS and various applications, but I am barely able to use that at all since I have no idea how to use it. It would be fun to play with some day.