you are so right. I currently only use " keep up with the car " function. It is challenging to recognize some many speed limit signs. I agree with you that I would like to see better imaging and better parking protection.I would personally rather see the data processing power used by ADAS go to improving dashcam imaging and functions such as parking protection which are not available in cars as-built. Many cars now come with ADAS which is done better than any dashcam can ever hope to do. Yet I also see that some (many?) dashcam buyers want ADAS features, so as far as marketing it may be worthwhile- especially if done well.
I've tried the ADAS functions in a couple of dashcans and have found them to be so unreliable as to be useless. There is especially a problem with speed limit sign recognition as those signs are not standardized world-wide which generally means that even if it works good in Europe, it likely won't in the US. If you're going to have ADAS functions then prepare to spend whatever effort is necessary to fine-tune them into something that works well; otherwise you'll get 'disliked' reviews from people who just don't understand the limitations of dashcams.
Phil
Ricky