My youngest DD (17) has SN and is very sensitive to some textures and smells, onions being one.
I cook my Vegan meals seperatly, sometimes of a morning and frozen onions are quick, easy and smell free. I find I have to use gloves, if i'm using fresh, otherwise, the smell seems to linger under my nails. I'd have to air out the kitchen etc for my DD.
I buy mine from Farm-foods (or Icekand along with frozen Spinach) and on occassion, I use their frozen mixed peppers, if I've got a really busy week and have to carry two meals a day around with me, because I'm not home until after 10pm. That way I'm only chopping Courgette and Mushrooms.
I always have frozen mushrooms in.
We're not all cooking for families and are in our homes for dinner/tea, or bedtimes with younger children.
You can't label someone "lazy" because of one set of behaviour, or use of an available product.