In contrast I went through SIN F for the first time a few days ago.. arriving a little later than I had planned around 4:30pm but the place was only about 25-30% full. Plenty of tables. There was no ack of my P1 or F status, indeed once through the entry nobody asked to see a BP or anything. This didn't bother me I just note it.
In contrast to the above experience I found the service very quick and the staff were friendly. Clearly they are geared for the rush hour as food came out so quickly I'd not even finished the squid and my next choice arrived

no complaint there.. I was impressed. I had several entrees as above - the duck (was bare bones looking as above but a nice taste), the squid (of course) and I then went for the black pepper stir fry which was amazing. My drink (Taittinger Rose) was refilled without getting empty and I finished with a delicious dessert and coffee.
As I finished it was now around 5:15 or 5:30 and the place was far more busy but I saw the staff going from table to table promptly taking orders, delivering food including dealing with a gent who didn't seem to understand what anything on the menu was (he was sitting right by me so I heard most of the conversation). The staff were polite, understanding and unflappable.
As the place was getting full with folks from QF2/QF35 and whatever else I decided to vacate and yes, there was a real lack of general seating outside of the dining area. I noticed some pax had set up their dining table with laptops etc as a work space because of this. I do not know if the mix which is heavy on dining is quite right, but it's obviously a hard call for the 5-7pmish rush hours when there's most demand.
(I then went over to QR and poked my head in there.. that was a lovely new lounge.. I was too stuffed with QF food to try but it looked interesting) and the seating varieties in the QR lounge were very interesting. The staff were very proud of their new space and QR in general)