Why not? I have to confess, I love my Tupperware. I have lots of other kinds of durable plastic containers, but the Tupperware set I got from my mom when my parents moved is by far my favorite. I love it so much that when my big Harvest Yellow salad bowl got damaged by a friend setting a hot toasting fork on it, The Husband went online and found me a replacement.
It doesn't warp, it doesn't break, it doesn't bubble in the microwave or the dishwasher. You can heat it, freeze it, drop it, and it doesn't leak. It's dependable. I like dependable. I like things you can count on—-flimsy has little place in my house, and no place in my kitchen. And, barring toasting forks, these bowls will probably outlive me. I much prefer that idea to the rampant disposablism of our current cultural attitudes.