Could you explain why you think so? My posts, at least, provide some kind of explanation. It would be good if you could provide some data as well.
Now about the timer. Let's compare it to chess. In chess, there are time controls: 2 hours for the whole game or 1.5 hours + 30 seconds per move. There is even blitz: 3 minutes, 5 minutes, or 3 minutes + 2 seconds per move. This does not change the gameplay. The same is true for Heroes. There is a 1-minute control, a 6-minute control, and a 4000+400 control. The heroes, like chess, do not become different. That's my logic. A change in gameplay is slow on level 2 or 30% resistance on expert.