Actual film doesn’t work like that (35mm or 70mm IMAX for example), but you are correct that most cinemas these days are digital and they use “1080p” (more accurately DCI 2K which is 2048×1080 when the aspect ratio is 1.90:1). There are a few that do 4K, but overall not that many.
The main reason that’s enough for cinema though is that those “1080p” films are like 500GB with very little compression displayed through a DLP projector, so they look a heck of a lot better than showing a blu-ray through a massive TV with palm sized pixels.
Actual film doesn’t work like that (35mm or 70mm IMAX for example), but you are correct that most cinemas these days are digital and they use “1080p” (more accurately DCI 2K which is 2048×1080 when the aspect ratio is 1.90:1). There are a few that do 4K, but overall not that many.
The main reason that’s enough for cinema though is that those “1080p” films are like 500GB with very little compression displayed through a DLP projector, so they look a heck of a lot better than showing a blu-ray through a massive TV with palm sized pixels.
Also you’re quite far away from the screen so even if it’s bigger you don’t need as much resolution.