It was me who raised the issue I have with being right handed. I find the deep sheltered part of the porch on my left awkward to access as easily as if it was on my right.
That is an interesting piece of ergonomics, where depending on how you use the porch to cook it suits left or right handed people:.
If you cook lying in the tent then the position of the door of the inner is the critical factor, along with depth of the porch where it can be accessed from the opening in the inner.
And
if you cook sitting in the tent with your feet in the vestibule then it is the space to either side of your feet, if I understand you correctly?
I'm left handed (for most things) but find would say the X-Mid inner doors and porch favours right handed people when lying down: I have to roll over on my left side and therefore use my right hand for the stove: not my natural hand, but it is is fine for me.
I don't do it myself (it is not as convenient / comfortable for me), but if I sat with feet in the vestibule I can see the porch is deeper on the left than right side so easier for left handed people.