It's logical and more profitable to build and stock spare parts for only two engines instead of three for the Boxster/Cayman series.

The Boxster is ageing and has lost some sales excitement, so more power is a good thing to get people excited about them again.

The Cayman got tons of good PR, customers like them, people see different things in them they never saw in the Boxster, like 911 competitor etc..

Porsches plan worked!