Instead we just regress to something resembling this:
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Sorry, but the 1980s ended decades ago! If you want modern Flat Design at least look at some Science Fiction shows for a proper idea of futuristic UI design, not regressing back to something more fitting to a 640KB RAM system with an 4.75 MHz 8088 CPU.
You're really stretching to equate the look of Big Sur to that screenshot. I would also point out that Star Trek interface designs were futuristic when the shows first aired (true for both TOS and TNG), but it's hard to say that now.