Much has been made about the weight and the ergonomics of the Z f.
I like the weight of the camera - I'd describe it as "substantial" rather than heavy. And a camera like this needs to have substance or it starts to feel cheap
As far as the ergonomics go, not sure why anyone would buy a Z f then complain about the grip.
Since there is no alternative to Zf if you want improved AF under $4000, there seem to be some buyers which otherwise wouldn't be interested in this body style.
There is an alternative. If you do not already use the Nikon Z system, there are several contenders worth mentioning regarding very good AF. And if you already use the Nikon Z system, then just wait for an upgraded body of the Z5/6/7 with improved AF. Why should these cameras all of a sudden be unusable the day the Zf was released? Do people move faster or do birds fly twice their speed since last week? I must have missed that. When AF was a significant problem for all those years with a Z5/6/7, then those people chose the wrong cameras for their use cases right from the start, didn’t they?
I'm currently shooting with Z50 which I ordered shortly after it was released in 2019. I used D7000 before that. After the switch I found out that I strongly prefer Z50's size, weight and also the grip, which is deeper and more comfortable for me despite Z50's overall smaller size and weight. Largest lens that I currently use is 105 MC (which then looks more like a lens with attached body than other way around) but due to the grip I have zero concerns if I can hold it securely or not.
I basically found out that Z50-sized body is sufficient and more bulk and weight won't bring me anything by itself and it just means less convenience and less opportunities to take photos since I'm more inclined to leave heavier equipment at home.
When I bought my Z50 four years ago, my main use case was hiking and travel. I don't have any complaints about its AF performance for this use. However, I became a father and then I found out that Z50's AF leaves something to be desired. I guess that I'm not alone and needs of others might also evolve in time.
My issue is that I don't see any upgrade path suitable for my needs at the moment since Nikon didn't introduce any significant upgrade to DX lineup during last four years and FF options are either too large, heavy and expensive (Z8/Z9) or large and with questionable ergonomics (for me personally) which transforms into even larger and heavier with additional grip (Zf). Waiting is an option but I feel like I'm doing it for almost two years now...