As someone designing electrical circuits that might or might not use a 7-digit display this seems rather to be a guide for which use cases to avoid them.
Electrical engineers sadly sometimes don't think about that at all and slap what they know onto everything. When you have a medical device where a reading error or ambiguity can have serious consequences you might want to be aware of that. There are 7-segment-display usecases where that is not an issue irrelevant, e.g. because you have enough contextual clues to not hold the device wrong and read it upside down or because the potential damage from a reading error is irrelevant.
But this is still a design consideration one should be aware of. Especially in times where 7-segment displays aren't necessarily the cheapest option.
Most other display technologies have their downsides too. For example, fot-matrix LCDs are far more fragile and more easily damaged by sunlight or heat than 7-segment LEDs. If you don't discuss that, but dwell on the downsides of 7-segment displays, it does feel a bit like a hit piece.
In fact, 7-segment displays aren't even a monolithic technology, and not all of the gripes in the article apply to every implementation. You have traditional LED models, LCD 7-segment displays, and then some OLED flavors, VFDs, and even electromechanical designs in niche applications.
As someone designing electrical circuits that might or might not use a 7-digit display this seems rather to be a guide for which use cases to avoid them.
Electrical engineers sadly sometimes don't think about that at all and slap what they know onto everything. When you have a medical device where a reading error or ambiguity can have serious consequences you might want to be aware of that. There are 7-segment-display usecases where that is not an issue irrelevant, e.g. because you have enough contextual clues to not hold the device wrong and read it upside down or because the potential damage from a reading error is irrelevant.
But this is still a design consideration one should be aware of. Especially in times where 7-segment displays aren't necessarily the cheapest option.