You people obsess on age, experience matters, after 7 ML seasons, it's not like Harper is suddenly going to figure out ML pitching.
Age only matters in two dimensions, physical maturity and experience, Harper is physically mature and he certainly has lots of ML experience. So where does being 26 give him additional upside?
Whereas Rhys at 26 has little more than 1 year of ML experience, so a couple more years of learning how to handle ML pitching means he still has an opportunity to improve.
My lineup is the "base" the Phillies have to work with, as we saw last season, it is the talent on the roster that determines your fate, free agents aren't going to make you a championship team if you're only a .500 team without them. Before the Phillies added free agents they were probably a 75 win team coming off 2017, so the free agents and TDL additions might get them to 81 wins this year. They fell short because the talent base fell short. You simply can't buy enough WAR in free agency to make you a 90+ win team unless you have a base that's better than .500 to start.
If the base isn't good enough, overspending in free agency will just make the next rebuild that much harder.