Well, back on this little problem of a hose puncture after hiting the ceiling while scootering in a cave.
The puncture was at the very begining of the hose , on the Rebreather side, where the hose is stretched by the connector himself.
IMHO for scootering this part must be protected against direct impact because the rubber of the hose can be easily crushed between the stone ( for example )and the connector.
On the website
Swiss Technical Diving Equipment you can see an EDO 04 with the connector fited on the Rebreather but without the hose.
Dont imagine I said EDO O4 is not bullet proof, it is,and the optionnal plastic cover is great ( except mine that needed to be modified)
You must imagine that your Rebreather is done the same way.
You must imagine your Rebreather with the hose connectors in it but without the hose to understand where is the potential fragility point in your own RB.
Then you protect or not, its your choice.
Hope thats help
Cheers
Marc