Why is there a logarithmic progression in the OWNDex level designs?

The OWNDex levels are designed in a logarithmic fashion allowing a more nuanced representation of progress or skill. 

It can provide a sense of accomplishment for players when they reach a new level. Advancing to a higher level can be seen as a significant achievement and can provide a sense of accomplishment for players.

Also, in a logarithmic level system, it becomes more difficult to advance to higher levels, which can help to balance the leaderboard and keep players from becoming too far ahead of others.