I’ve been using 6g black grow bags since 2020. The fabric prevents them from getting rootbound. In a smooth pot, the roots will circle round and round and basically choke itself. You’ll see that with transplants from the garden center. When the tips of the roots reach the inside wall of the bag a process called “air pruning” happens and the tip of the root dies, but the rest of it is in good shape. They don’t have drain holes but do drain well. They sit on top of wood chips.
I mostly use them for hot peppers, and though I can’t say they’re any warmer than the ground, peppers seem to like it. Peppers don’t need nearly as much watering as tomatoes, so I only water about once a week, twice if it’s been very hot and dry. Your planting medium will dictate how well it holds moisture more so than drain holes. I used a few bags last year for cheery tomatoes and they did well, too. Super Sweet 100 tomatoes grew like weeds and I didn’t even stake them up.