If you want open source adoption to continue to be low, please, keep making comments like this.
If you want people to switch, the apps need to be appealing not a chore. And relearning a workflow you've fine tuned over decades is a serious chore and may even be detrimental to your job.
You can try WhoBird. It's open source (available on fDroid) and runs completely locally on the phone. I've had decent success with it even in noisy environments.