PWAs have the advantage that they can be used on all mobile devices – despite minor restrictions.
Yes, they can be used on different devices (e.g. smartphone, tablet and desktop). Since they display a responsive behavior (automatic adaptation to the screen size of the used device), all information (text, video and audio material) can be easily displayed and played back on the terminal devices.
on iPhones it is not yet possible to send push notifications via the PWA.