Well in my case the key in the car (in case garage remote does not work) gives no added risk. But… if car stolen there is already plenty of risk from the garage remote - the door from garage to family room is not locked (except by me rarely from inside, when my husband is out of town).
That family room door is where I think we should start with the keyless entry. On the external doors, my main bloody concern is that shifting has made it very hard for me to lock and deadbolt front and back door. And if you don’t do it right, wind gusts blow open the back door. Before we go on vacations (leaving through the family room door to garage), my husband does last-pass locking. Next time I’ll suggest we use key to lock the family room door too.