It would be nice that, when I click to add a new translation, the post copy the same date of the other lang post (wpml has this option) to not mess up the order of the posts and make the user revise the date and hour and change it manually
It is possible that WPML does this. But Polylang is not a WPML clone and both plugins work differently.
In WPML the default language is the 'master' and the other languages are 'slaves'. All posts exist in the default language and when you synchronize your published date you just have to copy from the default language to other languages.
In Polylang there is no 'master' language. This gives one advantage: you are not obliged to have all your posts in the default language. The drawback is that I can't choose the "published date" of the already published posts to make the synchronization without blocking the possibility to change this date after the first publication has been made. So I chose to make the synchronization in the other direction.