Well, I am not tired of learning new things. Every new technology or language I learned, became useful in the following steps. They made my work easier. But, hey, the market is still greedy for new things, even more than past. Now, I am faced with more variety of things to learn: front end technologies like React.js, Vue.js, Svelte, all kind of trending databases, various cloud platforms from Microsoft, Amazon, Google and even IBM, programming languages like Go, Python, Dart, Ruby, TypeScript and PHP, mobile platforms including Android and iOS as traditional ones and, PWA and Flutter as new trends. Not to forget practices like automated test, AI and design patterns.
Ok, I know that a single company does not use them simultaneously. However, when you change your company or when you hire new developers for your team, you may be not lucky enough to meet tech stack which is more familiar to you. Chances are that the new team uses an entire new technology practice than what ever you used to.
It's not an impossible mission to learn new technologies or methodologies. However, it's a bit overwhelming. It's a bit stressful to decide a correct priority, and keep it in your daily schedule along with other tasks.
BTW, did you noticed that the version control system has not witnessed a fundamental change in recent years? It's a long time that git has not been replaced by any competitor.