Folding phones seem, intuitively, like a great idea. Phones are good! Tablets are good! Put them both together, fold it in half, and presto: you’ve made the best of both worlds. Credit to Samsung, too, for willingly subjecting itself to all the growing pains of figuring out how to make a good foldable phone. Last year’s Galaxy Z Fold 3 was a good foldable, and the new Z Fold 4 looks to be even better, if ever so slightly. (I have lots of thoughts about the new era of flip phones, like…