Disagree entirely. The stock phone app is likely the least used app I keep on my phone.
maybe what we need is a 3rd party dialer that pledges privacy.
Anything bound to any companies' services or doing any data collection should be entirely user-controlled and user-replacable.
It seems like the alternative you're suggesting is that vendors be able to lock you into their own dialer, which was probably produced by an outsourced firm anyway.
Or are you advocating that Google prevent people who download and modify the Android source from modifying that particular aspect of it?