The lady isn't choosing to "have her feet up," she is essentially sitting on the floor and forced into the L shape by the rigid structure around her. There's still incredibly little range of motion just like a regular seat, except now with the added danger of a much more difficult emergency evacuation, especially for people with limited mobility.

Also, I'm imagining that there isn't a wall right in front of her face, as this angle suggests. But rather, there is a bit of a cavity tucked up under the top seat. Oh, yeah... found an image. It does still look a little claustrophobic in there.

Claustrophobia. It's an absolutely fucking not from me, dawg

My biggest problem with the space is that if I had to sit with my legs out like that, I'd eventually cramp up and inevitably bang my knees on the chair above.

I suspect the angle might make the space look smaller too, it's possible that the wall actually extends a bit out without being solid inside

She's also fully reclined her seat. So maybe if her seat was upright it would be easier for people to get in and out.

An issue with this is getting up mid flight

This is marketing meaning if this ever actually came to market (and it won't) they would immediately begin adjusting it to reclaim even more room causing cramping with each new redesign. People are very easily conditioned so years after this became a thing and multiple redesigns later people would only just be beginning to realize it has already happened and even then nothing would change because the general public won't do anything while a select few will complain and make no impact.