I often put pockets into things or make pocket bags where there are faux pockets.
I think it depends on how you wear your clothes and what the pockets are for.
I like to put my hand or hands in my pockets when I'm standing or walking, I like
to use those pockets to tug the jacket. I'm obviously not Team Polish. If you are and
the fabric is somewhat thin, whatever you put in your pocket will distort the jacket front
unless it is quite lightweight and thin.
For putting your hands in your pockets, take out two jackets you already have - one with pockets at the side seam and one with pockets in the actual front area. There is a big difference in comfort. Also, pockets at side seams tend to balloon out a bit and unless quite deep, whatever is in your pockets can work itself out while walking or slip out while sitting.