Why are they out of fashion? Is it because it is too hard to figure out why a particular neural net makes certain decisions? Are they generally too unwieldy and

Why are they out of fashion? Is it because it is too hard to figure out why a particular neural net makes certain decisions? Are they generally too unwieldy and unpredictable? I'm very interested in neural nets but I don't know much about alternative tools/models, so I'm keen to hear your reasoning.