Ok, to answer your question it's a YANBU from me, I don't think it's a problem. It's probably not the best value (although if you can afford it, then fine). My only niggle would perhaps be it's getting you out of the habit of producing meals for when your DC are old enough to eat with you. I'm less precious now, but when my DD was tiny, she had the finest of everything to eat because I didn't want to fill her with crap because she was so perfect to me (but I accept I am very pfb, and esp was when she was little. Now I just throw crisps at her).
I would say at this time of year it's very easy to get very fresh and very yummy ingredients cheaply which make delicious meals in minutes (like a gorgeous salad with basil/spinach/rocket, lovely tomatoes, avocado, etc). Understand time might be an issue, but if you've access to a food market these things cost pence and taste great. More challenging to do this in the winter months.
I home-made pesto this weekend for the first time (to be clear, that wasn't stealth boast, it was an actual flagrant one). The recipe (Jamie) said it took 5 minutes, with lots of comments agreeing. It took me nearly an hour and a half (because I am a rubbish domestic goddess!!!!), but the ingredients were all fresh, and it smelt fantastic as I was preparing it, and because I knew I was going to do it, I checked out the ingredients on a saclar jar, and it's full of emulsifiers and additives (fair enough as it may have to sit on a shelf for months), but mine was all fresh.
We do quite a lot of making something in a quantity over the weekend and bagging and freezing. Soup works well for this, but not everyone wants to eat soup (but yummy with crusty bread, and very good for you. Well, depending on the soup!)