Don't be daft. Why do you need to carry a bag round the house? You leave your phone wherever. You put the wrapper in the bin.
Pockets are useful when at work, or out and about although unless you're buying more expensive clothes than standard high street, excluding useful pockets would mean you'd never buy anything at all.
Coats often do have better pockets, but that's because my two main coats are a winter and a summer hiking waterproof and the winter version (Didriksons) is pockets galore, meaning I can take a map, water bottle, keys, phone and still have somewhere to put a hat and gloves if I take them off and my hands if I so wish.
But I don't necessarily find pockets more convenient. Every time I watch DP go in and out of the house, loading and unloading his pockets with all his bits and pieces, I think who CBA with all that? I just pick my bag up and put it down again.
Plus I'm here sitting at a desk and even if my trousers did have useful pockets, I couldn't put my phone in it because it would dig into my hip or feel like it was straining the phone at the back. I've seen the state of DPs passport because he carries it around in his pocket when travelling, he's lucky if it will last until it expires before it's refused due to being all bent and creased.