The numbers above/below/in/behind the units do not affect the gameplay in any way, but HD+ already breaks it, at least by changing the skill tree. So at the very least, it won't be any worse.

The skill tree is changed for offline mode; for online mode, it remains random with certain probabilities, as it was before. If it were somehow known what would be offered at the next level, then I would agree that this is a change for the better.

Should we go back to pure SoD?

We're already playing SoD. HD+ isn't critical for me; the HD interface is enough. If a player wants to separate a unit, it's just a matter of time, whether it will take 1 second or 20. If a player wants to see how far a centaur will move, they can either turn on the highlight and spend 1 second, or count the squares for 30 seconds. But knowing who goes after whom is already a direct hint that is not provided by the game. For example, when all the stacks of griffins are gathered in one pile, and you need to guess which one will go first, then in this case, it's not the same.