If my DH is going to be on his own for a few days, he can shop and cook ok, albeit for a limited and very highly predictable range of meals.
Normally, I both cook and do the shopping (mostly online since Covid). On the very rare occasion that I ask him to get anything for me from the supermarket, he will find it, but nearly always calls me about something to make sure it's the right thing. I don't mind that - I would do the same if the boot was on the other foot.
What I hated before started shopping online, was having him trailing round the supermarket with me.
He would either quite literally be in the way, standing between me and the product I wanted to get off the shelf, or, if I ever wanted or needed his opinion on anything, he would be nowhere to be seen! When tracked down, he would usually be standing examining the label on some obscure item.
Oh, and the fun I've had trying to reunite with him. I would spot him at the opposite end of the aisle, gazing up it, quite clearly searching for me, yet not seeing me, even though I would be jumping up and down, waving my hands wildly, to try to make myself visible. I would see him move on to the bottom of the next aisle, so I would do the same at my end and repeat my jumping and waving, and so it would go on until I would have to run several aisles ahead, race down one and finally be right there next to him where he couldn't fail to see me. 
This trolley dash was funny the first time, and probably hilarious for anyone watching, but it became rather frustrating when it happened every week!