Working on legacy systems is a career dead-end
I work for an out-sourcing company doing support and development of "legacy" systems for various customers. The most modern technology used is 15 years old. When the customers finally decide to replace the whole thing with something agile and "Digital", I could be a bit stuffed. The customers think me and my employer are slow-moving dinosaurs. Because I work for multiple customers, it's unlikely TUPE would be applicable. I spend at least 10 hours a week of my own time self-training in modern technologies, which are almost completely unrelated to the stuff I use at work, and this is likely to continue. I don't see how this is sustainable.