The tag should be used for question exclusively related to TensorFlow >= 2.0 versions. There exist a couple of differences between TensorFlow2.X versions and TensorFlow1.X versions; therefore, it is natural that an exact tag distinction exists between those major version differences. Minor versions between TF 2.0(e.g. 2.0 vs 2.1) also bring code/framework differences; thus it will be incorrect to use the tensorflow2.0 tag at every question.