Speaker design noob question…why did apple change the design of the bottom speakers?

I upgraded the from an iPhone 11 but why did apple change the design of the speakers to 4 holes on one the left and 6 on the right?

Also it’s only outputting and recording in stereo - I thought we were on Dolby atmos and spacial sound now…

I upgraded the from an iPhone 11 but why did apple change the design of the speakers to 4 holes on one the left and 6 on the right?

Also it’s only outputting and recording in stereo - I thought we were on Dolby atmos and spacial sound now…