Discussion on answer by Ertai87: How to deal with an underperforming subordinate?

The reason it's "work" is because learning Angular is not something John would like to do in his free time, hence why he hasn't done it already (and continues to not do it), and it provides no value to John personally except inasmuch as it provides value to the company. - maybe a bit provoking, but not getting fired for being a bad fit (from a skill perspective) isn't enough of a personal reward? It is a tough topic, but upskill education can't just happen during office hours only.