But you're missing the point - LUL have gone for a completely different seating configuration.
The units the OP mentioned, such as the 306, 502, 503 had seating not dis-similar to the EPBs, the difference was though they had 1/3 2/3 sliding doors, plenty of standing room, far better access and no need to clamber over other people's knees when boarding or alighting.
That's still quite a bit of waiting around to get in and out. If you were sat by the window, you'd still have to do a bit of clambouring over people as well.

