I think you nailed it. The game experience from mid-level onwards is likely going to be similar to 3.x - possibly not that extreme, but close enough. Spellcasters in the hands of players who know what they are doing will dominate the game pretty much all around. Actually it's not even that: it's that they play a different game with its own rules: it's like doing sport and have a way for some of the participants to ignore gravity.
And this is the 'classic D&D feel' for you, the one that this edition is setup to recapture to bring back PF players - which is a perfectly legitimate intent by the way.
That is not to say this is 'bad' per se. It's just an approach to the game, and it is a well consolidated one too. I personally moved away from it many years ago and have no interest in going back, but luckily there are options out there.
On the plus side, magic system aside, this edition seems solid and well laid out, so it could be a good platform for further development and alternatives moving forward.