We now use the MK50 Jacket with Category A EBS so at least pax have approx 2 minutes of breathing air
These jackets are widely regarded amoungst the passengers as a joke. You’d need to be a proficient and well trained diver to have the presence of mind to operate them properly, not an offshore johnny doing HUET once every three years. Efforts are better spent getting out than fumbling around trying to get the EBS figured out.