I think that they should’ve stayed in studio 7. If they had put in high techc windows that dim and go lighter, it would’ve been fine. However, that would’ve cost a bit
Err - they DID do that. The windows
were
dimmable - Daybreak spent a lot of money on them. That only solves the bright sunshine problem. (Which This Morning have solved more cheaply with their polarising filter solution)
The bigger problem is in the hours of darkness when you need the backdrop outside the windows to be reasonably bright (and your windows to pass as much light as possible), otherwise you end up - at best - with a black wall, at worst a mirror...
The secret of windows at night is that you need your backdrop outside to be lit brightly enough to balance with your studio lighting. You can reduce studio lighting to relatively low levels (and modern cameras have helped hugely) - however you still need something lit outside. Daybreak didn't have that - and they initially reduced their lighting levels so low at times it was incredibly unflattering.
During the late evening some of the buildings in the back of Studio 7's shots (like St Pauls) are illuminated and help solve the problem (and LNN did well to make London Tonight look so good by ensuring their shots only included 'lit' backdrop areas) - but they were largely shooting link shots rather than doing lots of chat. Also AIUI most of the buildings that might have helped Daybreak had their lights switched off in the mornings...
The One Show cope well with their windows at night because at both White City and Broadcasting House they have a backdrop that they were able to light themselves (as the backdrop was largely BBC owned and the BBC could light it). Daybreak's backdrop was far further away, and thus a LOT bigger...