Think about fixed pitch props and the need for a very coarse pitch to achieve high cruise speeds, how well would that work at slow speed such as on take off? Given the limited thrust available from such an inefficient prop at slow speed how long a take off roll would be required for such an aeroplane? Where would one find a sufficiently long and flat take off surface on land?
You don't see many seaplane racers after they invented VP props!
Happy landings
3 Point