I would not worry about the ditching discussion as
VB sees it unecessary to carry liferafts despite the expiry of the CASA dispensation which rolls on by consent - [refer also CC manuals with overprinted notation]
As for catering both doors before/while pax are disembarking 'when an a/c is running late' .................... all I can say is that is the single most absurd and arrogant and unecessary risk if the a/c had to evac'd. [have a look at the China Air 737 fire - BTW they had six CC]
To 'recater' a 737 takes minimal time - there is no justifiable reason to reduce primary door exits by 50% just to preserve the B.S. obession with 20 minute turnarounds.
This is the sort of arrogant nonsense that only proves that the self governing regulatory environment is both ineffective and myopic and the operator has a demonstrated ineffectual understanding of risk process.
Any crew that allows this kind of breech needs their collective ar*ses kicked -