I started watching and realised it was a mash up of other videos. I see the need for the extra storage with cottages but it does block some light out with those cupboards jutting out other side of the window.
When we renovated our old house we had a similar problem with light and storage/space. In the end we built an extension and have a bright modern kitchen, and kept the old kitchen as a reading room with woodburner, chairs etc. It was 3 years of stress and chaos but it was worth it. I feel like Maddie's house is crying out for an extension. I would have done that first, especially as it isn't listed (unlike mine - never again!) But it means we were able to keep the integrity of the old part of the house, without ramming it full of stuff.
It seems to be that the back of her house is where all the money shots are - the front doesn't look as nice from what I little I can see in her videos. So putting an extension on would change the look of the back of the house a lot, which is maybe why she didn't? I just think eventually they will need an extension if they have kids, speaking from experience of living in a very old house with limited space and a growing family.