I have seen people being put on a project not in their field and start with a lot of enthusiasm. FFWD 1 year and they don't particularly have talent for their new job, they feel they took a wrong career turn, they just aren't progressing (I also saw the opposite btw). It is difficult to judge this in advance and thus a risk. Now I feel it can still be done but only with people who are honest to you (project lead) and themselves by being willing to admit they either need more training or really should be doing something else. But this ability to reflect is also something that often comes with age/experience. I think I work at a company where it is certainly appreciated when you try to develop new skills and failing or losing interest is not a big problem but as a project leader it can be frustrating to think: "Hmm, well that was an FTE I'll never get back." Especially when you see the person really not enjoying themselves. Of course, this is a learning curve for the project leader as well and it turns you more into a coach from time to time. Which is fun tbh.