No not really.
Restaurant in front unit will leave very few non dining first class seats. Therefore those with first class tickets who are not dining will need to use the rear unit. They will have to change at Plymouth if going further west.
Alternatively restaurant in rear unit, restaurant customers will have to use the rear unit to dine, and then have to change to the front unit if going beyond Plymouth.
Which ever option is used, significant numbers will have to walk along the platform at Plymouth. All part of downgrading from proper inter-city trains to short DMUs.
Earlier on I'm sure I saw a post bemoaning that the service only has 17 seats vs the previous HST allocation, yet it's now a "significant number". I thought that the Pullman service has first call for dinner at Newton Abbot and the last call at Taunton with the service packed away by Reading on services departing WoE so surely the departure boards could be preset to indicate which part of the train to board for dinner and on joining services to advise walking down the platform at Plymouth if the service is starting in the waiting unit.
In terms of the London departures I'd expect that over time 1st passengers would board the continuing portion at their origin station leaving only the Pullman passengers continuing towards Penzance seated in the wrong part and needing to move down the train at Plymouth, surely and logically the Pullman services can't have every seat occupied by passengers going beyond Plymouth all 17 of them (or if they did it would not have made sense to schedule a splitting diagram). Ironically if Pullman demand becomes consistently strong then rostering 10 cars with both kitchens in use would be a method of increasing dinning capacity beyond the HST service (34 covers vs 24 covers) as was.
What is the 1st class loading Penzance to Plymouth like in the morning and afternoon? and again Plymouth to Penzance in the evening?
The sub two hour journey time between Plymouth and Penzance also makes a WoE only service currently impossible to deliver as the full three course menu takes a little over two hours, hence the service starting at Plymouth and I assume the chief joining the service.
Of course they are. Throw more money at it (buildings/staff/equipment) and they'd be completed in less time.
The problem with speeding up manufacturing isn't usually money or for that matter staff but building/facilities. Generally a new build factory unit is a 3 - 4 year project from land acquisition to start up, it typically takes at least a year get a spade in ground then two to three to build the shed followed by 6 to 12 months of fit-out and commissioning. Actually hiring the staff can be done whilst the shed is being built and in most cases the initial recruits can be trained at existing facilities whilst the new one is being built. Map this back to the mk3 power door programme and by the time it became apparent that dates where hopelessly optimistic and even with the very slow rate of delivery any new facility wouldn't become operational until after the programme will have completed at which point the added capacity is pointless. Remember mk3 power doors are only happening because industry couldn't deliver new build stock in time for RAVR, post 2020 and there is spare capacity for new builds with Hitachi and Bombardier.