Except some will say "you're in my seat"
If safe standing ever does arrive , I doubt it will be a general area allowed to be filled-up randomly.
In the days of the old kop , you & your mates just shuffled and squeezed your way into your favourite place.
In two decades standing on the kop , whether there was 20k on there or just 7k , we never failed to get right behind the goal just above the horizontal walkway halfway up.
But safe standing contraptions will physically prevent such movements.
Will need to be allocated slots , otherwise gaps will get left all over.
The only way it will improve the atmosphere is if ALL the occupants are singers.