The 27th pick in the draft is an interesting pick. The Phillies are really good and win a lot, hence the drop down the list. One would like to have one of the top talents available in the draft, but that would mean the team did poorly the year before.
We can guess as to what they actually need (upper level hitting, hitting of any kind really), but in the MLB draft, teams rarely draft for need. After all, there are no Paul Skenes players in this draft that could help immediately.