Tomato ring culture

I grow all my tomatoes and lots of other GH plants in ring culture pots - but mine are rigid ones, basically flower pots without bottoms. I bought the original ones when I started growing toms and have since made my own by cutting the bottoms off MFBs.
As you know, all my GHs are on solid bases - not soil - so I needed a way to create soil depth without making raised beds. I have tried them in growbags but I don't like the potch of watering them.
Never used floppy pots.

If your gh is on a solid base, why take the bottom out of your pots, is there any soil for the roots to go into from  the bottom of the pot, or is it that whatever soil there is is very shallow?