[richardthered]

In general, I think that having knowledge of multiple different tech stacks is good. The IT industry is constantly changing and evolving, and learning to evolve and change is good.

Also, you might want to take a look at Flutter. It's a new(ish) cross-platform mobile development framework from Google. It seems to be getting some traction, and allows you to write truly cross-platform mobile apps. There are other cross-platform mobile frameworks (React Native, ...), but Flutter seems to be gaining momentum.

Anyhow, if you are interested in mobile development, give it a try! It's not you are locked into your choice for life...