The pertinent question is what is "affordable" - if you're looking at a £ 400 TV.
Not so many years ago (early 1990s) a branded 21" mono TV from the likes of Panasonic or Sony would have set you back £400, a 25" with NICAM stereo from the same brands would have given you a bill of nearer £ 600.
Now that £ 400 of 1990 is £ 1139 in 2024 terms, and the £ 600 is £ 1709 in 2024.
The £ 400 of today was about £ 150 back in 1990 and that would have bought you a 14" colour portable, or just maybe an basic, remote control, 'own brand' / unbranded set.
So the complaint that "oh £ 400 TVs aren't very good" is a bit wide of the mark - you're looking at over 40" LCDs with Smart functionality on board for the real terms cost of a basic portable TV 30 years ago.
To look at
NOldrini's point - Sony have made a conscious decision to abandon the lower price points. The profit simply isn't there on £ 300 / £ 400 TVs at the quality they want to produce. Perhaps it's unrealistic to expect a Sony quality of product for so little money ?