I remember how cramped the 455’s seemed pre-refurbishment.
I’d often see people get up from seats at Earlsfield
On the contrary, the low backed seats gave a much more open and airy feel - the present high backed ironing board seats are decidedly claustrophobic - and the seat pitch is so tight that anyone over average height (50% of the population) cannot sit comfortably in the face to back window seats and can only do so in the gangway seats by putting their legs in the gangway, reducing the space for standing passengers.
And the moquette is too garish.
The original seats also had useful perches shaped into the ends, fir the comfort of the standing passengers.
With the new trains the problem of having to relinquish your seat early no longer existed as you probably didn't get one in the first place because of the reduced seating capacity - the extra standing area so created not even being enough to accommodate those who had previously had seats.
But if you have a window seat on the refurbished units it is very difficult to get out unless your neighbour cooperates.