What's the problem? It's that distance that counts.
Because it requires you to sit with your knees together dead central rather than actual proper spacing of seats, the seats will be much closer together at the end of the day, there will be only a little less room for knees, but it means that getting in and out of seats is going to be worse because there will be little room since you canot avail of the room in the seat backs until you sit down.
This seat is not suitable for a journey like London to Norwich, it's a seat that is suitable for short distance or local DMU services, for what it's aimed at, but it is not suited to longer distance services.
By the front of the indent I don't mean the part closet to your knees, I mean the part furthest in, it's far better to have the space between the two seats to be a certain amount rather than a small part of the seat to have that certain amount and the rest to be tightly packed.
As I said, the Norwich passengers and the MK3 passengers are going to have a fit about being downgraded to a local DMU seat. The layout as shown on page 4 of the PDF I posted is laughable, it's no way suitable.
So funny that on their flagship service, they are going for such a lean, lightweight, crammed in seat, guess that's what happens when you buy too many trains, corners have to be cut and they're cut many.