To note something else in addition to the other responses there’s also mirrorless cameras which basically have all the practical advantages a DLSR gets you. The mirror specifically didn’t make the camera better, rather all the other stuff like better sensors and lenses.
The reason you need a mirror in a DLSR is because the resolution and speed of older, non mirrored camera screens was simply too slow and low resolution. Having a direct optical path through the lens to your eye bypassed that. You can see it in your cell phone camera too as the slight lag between when you move it and the image is updated.
So for a while you would never see a professional camera that wasn’t DLSR. Modern electronics are fast enough now, and provide real advantages like faster capture speeds to make them proper competitors to DLSRs for some time, and most manufacturers have moved to mirrorless for their new flagship cameras.
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