I jumped into Web Development by the time Polymer was hitting v1.0, and it was a clear choice to me to go in this direction compared to go for Angular/React and Co. What was really important to me was the flexibility you can have using it. You also have a bunch of tooling that can help you, a very dedicated community for both helping newcomers, discussing Polymer and its component features, building and enlarging the number of available web components, etc...