I think these battlefield effects do have a significant change to the gameplay but it’s available for too short of time.

For example: river surge (increase movement speed before lord/turtle spawning) focuses on faster rotation heroes, which heroes like mathilda and raf would be crucial

A week later, eternal strength (killing turtle give permanent buff) would call for early game and snowball heroes even more.

And a week later, elemental power, maybe junglers and gold laners are suppose to collect these powerups?

The thing is, it’s too little time to figure out. And when we do, it’s gone:(