Introducing new units and objects doesn't necessarily mean changing the gameplay and spirit. The main thing is to preserve the atmosphere, which, as I understand it, is what the team working on HotA is doing.
The atmosphere and spirit of the project are preserved as long as foreign elements are not introduced. The changes implemented by Alexander do not create a feeling of external interference. Everything is as organic as possible, and I play with the same pleasure. This wasn't the case with "Horn of the Abyss."
And in general... From an aesthetic point of view, nothing has been invented that is better than "The Restoration of Erathia," IMHO.