There is a good case to be made for "keep it simple". It sounds like a great idea to connect a dashcam to your phone, but that brings so much more complexity into it. Networking, security, updates, changing phone OS and so much more.

I started to buy simple "single purpose" devices without connectivity in the last few years and so far it has gone great. Yes, I might have to take out the SD card and put it in my computer if I want a dashcam video, but I know that my dashcam doesn't need updates, will work until some hardware failure sometimes in the future, I do not need to worry about some chinese cloud service going down or someone spying on me with the app.