You really should speak to LNER and ask how many complaints they get about seats, very very very few.
Customers numbers went down due to Covid, but rapidly increased to precovid levels.
I travel many hours a week in standard class on Azuma, and guess what, am yet to hear of a person complaining.
The complaints I see, only seem to be on this forum of Facebook enthusiast groups, usually from people who have not travelled on an Azuma. But have read about complaint or seen pictures of the ‘horrible’ seats.
Yes, some people will find the seat uncomfortable, like people on every train in the country do (I hate the seats on northern 156s, doesn’t mean droves of customers have deserted northern).