I have this argument with my wife often. I like to cook, and for me cooking is more than taking frozen meatballs and dumping them into a pan full of jar pasta sauce. I would rather make the sauce, maybe have some meatballs made in advance. My wife seems to think that pre-made stuff or mixes are the way to go. I would rather just make pancakes scratch, which isn’t hard, where she would rather I just open the mix, add water, and make the food. But I do agree that having a frozen lasagna is better than taking the full effort when I just want to get dinner going. So where are your eat the pre-made vs make it from scratch?
My thinking is along the same lines. I think OP and his wife both have good arguments for making certain dishes certain ways. And indeed, it seems (to me, in my unqualified opinion) that they need to have an ongoing conversation about which dishes each wants made which way.
OP’s wife is nostalgic for a certain boxed pancake mix because it reminds her of her deceased mother? Cool, that’s pretty low-stakes, just make the boxed shit. But part of OP’s self-care routine is cooking food from scratch, and that’s important too.
OP is right that fighting over this is silly. OP is wrong that scratch-made will always be better. Oh, I’m sure it will taste better, but in the long run it will be worse for OP’s marriage.
And crucially, they both need to be flexible. If OP takes pride in their cooking and the couple is having company over for brunch, then maybe leave the boxed pancake mix in the pantry and let OP wow the guests with their delicious and fluffy scratch-made pancakes. And of course, OP needs to remember that that flexibility is a two-way street.