It's a trap for your career! For juniors they get wasted because, the few seniors that can (and want to) guide them are occupied with urgent worthless tasks or they have 5h meetings per day. For the seniors they want to evolve they don't really have the chance to do it and prove their worth, just because they are externals in a project they don't own (like every outsourcing scheme). They are buzzy with the tasks that owners don't want to do!