How many diferent styles of boats do you use?
It is important to have different boats for different situations. Like a surfer has a quiver of boards so should a kyaker. If running a river is your idea of kayaking the appropriate boat should be utilized. When in a play park, the style of boat used is very different.
Size of river, volume of water, technical moves, ease of self rescue and pinning probablility should dictate which boat you use in each situation.
All river crafts
High Volume boats
Down river racers
They all have their poupose. Try to substitute one for the other and you skills will be challenged.