I don't believe you're understanding what I'm saying.
I don't object at all to there being categories of room on board:-
- Seat
- Shared berth (debatable, and this has been removed from fGW's Sleeper)
- Private twin room
- Private single room
- Private premium single room (or whatever, though the latter is IMO taking the mick at present as they are identical and all you get is a basic bit of extra service).
What I do think is that overlaying First Class and Standard Class on those categories is unnecessarily confusing[1], and thus it would be better if the Sleeper was entirely Standard Class, but instead when paying your supplement you pay a supplement (or indeed a global fare as they're selling on their website) for the relevant room category on top of a Standard, not First Class, ticket.
[1] And, absent single-fare pricing on IC services, expensive. Most business travellers these days are not allowed First Class, but are likely to be able to convince their boss to pay for a single room provided it doesn't say First Class on it.
Neil