So what's wrong with that? Why should we limit the game's possibilities with time restrictions?

Nobody is limiting anything; if you want to spend 20 minutes hitting zombies with a harpy, go ahead. I would just prefer to spend that time on something else. :)

Besides, you might not have played with these timers because they are sufficient, and the game even turns out to be of higher quality than with the classic ones, because you choose how long you want to play – but the myth that every turn would involve intense battles and frantic macro-management is just that, a myth.
So, you're panicking for no reason; first, play with the timer suggested by Vic.

No one was advocating for mandatory timers; read the previous posts carefully.

To reiterate, the idea is to add recommended chess timers to the rules.