You are correct, they both show submission to authority and both provide debatable protection.
There are debates that wearing a mask provides very little protection. As is with seatbelts, there are those who argue that in some situations, wearing a seatbelt is more dangerous than not wearing it.
In either case, it should be my decision and not something the government should be trying to force me to do. The government's job is to protect my rights. It is my job to protect myself and my family.