I disagree. I absolutely love the fact that I can just turn it off after office hours and throw it in a corner during holidays and weekends. Sure, it’s a bit cumbersome to take two phones with you, but it’s also cumbersome to take the laptop and everything with you all the time. Just put it in the same bag and you’re good. Good to note, my employer provides me with a phone, so I didn’t need to buy a second one. It also means that if I switch jobs, I just return the phone and still have my personal device.
But if it doesn’t work for you, by all means, don’t do it. For me the good outweighs the bad.
I run a similar setup, but with syncthing as the syncing system. Every time I connect the phone to the charger it just syncs the database and I can even sync it outside the home network. Works like a charm. Worst case you get a sync conflict which is easy to solve.