The standard modern fire safety closure on external apartment doors has a quick-slow mechanism that is usually enough to prevent it slamming – if it’s adjusted properly.
We used to have fire safety guys come round and adjust ours to “maximum slam” and we would adjust them back – this went on until we sacked them.
If the door closing mechanisms are out of date then they are probably unsafe and need to be replaced. If they are modern ones they need to be adjusted.
One general comment – if we could all just move back from the American model of “who can I sue?” to the traditional Australian model of “how can we fix this?” then everybody would be a lot happier.