I have 3 kids around the same ages. I wouldn't say they're the hardest thing in life but they're often a very difficult variable to manage along with life's other challenges. They have this compounding effect...
Maybe there are no carts at this store for some awful reason. Maybe the story was so focused on how this type of key solved their problem that they didn't give a fair shake to other possible solutions. More information is needed.
There are multiple ways I can/do give benefit of the doubt, but doing so doesn't make the situation any clearer.
I have a hard time imagining snow such that you can walk to a car with four kids while carrying bags, but can't push a cart.
> even with a cart you still have four kids to keep an eye on.
I would posit that kids + cart + grabbing keys is basically always preferable to kids + both arms full of bags + not grabbing keys.
Damnit, speaking of unwanted features...
I have this smart key thingy too and I keep it in one of those RFID pouches. Since I don't have to use the key to start the engine, I feel the whole thing became more of a problem than it was before. You at least always knew where the key is and where to put it. Now it sometimes slids down the seat, or is in my jacket that I wanted to leave in the car or the engine/electric is not on/off because pushing the button does several things. It became an inconvenience and the few times I really used the automatic open feature after deliberately taking out the key out of the pouch to profit from it are negligible.