This hasn’t been my experience - while I’m not familiar with a wide breadth of terminal emulators, all the ones I’ve used have a default black background with the ANSI colors being very bright, making them clearly visible. I would again say that if a terminal emulator has some of the standard ANSI colors set to not be visible on their default background, that is the terminal emulator’s problem, as it is clearly undesirable.
And of course, once a terminal program starts changing the background color then it can’t make any assumptions about which of the user’s colors will be visible - which is why, as you say, the background color should not be changed without a very good reason. If the bg is set, it should be very easy to switch it to either a “dark mode” or “light mode” to make colors visible.
But some assumptions must be made in order to make any use of color, and “the 6 standard ANSI colors (red, green, yellow, magenta, cyan, blue) are visible on the user’s background” seems like it has to be the safest assumption.
I am in support of terminal programs respecting a universal configuration to disable color: https://no-color.org/
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