In the old cars with no built-in remotes, you had your remotes in the locked compartment box. In the new generation of vehicles, the remotes are turned off when the accessories are turned off (immediately or by timer).
If you have your parked car outside the garage with the garage door remote inside the car in a visible place, then you are stupidly looking at getting burglarized. It is as stupid as leaving your house keys inside your car.
I can almost swear that my seats and my remotes did not worked after some time, but after people posted their experience, I tested it myself and had to retract my original post.
Nothing wrong in recognizing a stupid old man mistake, but it will be really stupid for people not realize Acura's design error in their HomeLink implementation. Rolling door opener codes, sturdy garage doors, double door locks, etc. all that is useless if they can just press the remote an open the garage door and break into your home.
People who put the remotes on their home visors normally park the vehicles inside the garage, but not all the people parked their vehicle in the garage because it may be full or temporary occupied.
This is clearly a poor design mistake by Acura and maybe people that think like you are the ones that poorly designed the HomeLink power feed. Anybody with basic security design considerations would have powered the HomeLink remote from the accessory power line.
Even Acura recognizes the security problem and potential consequences/implications and will try to address it in the future. They didn't try to come up with excuses for their design mistake. Saying that it is the way it is and doing/saying nothing does not help anything in solving the issue/defect now and in the future. Now from this post and after contacting Acura and HomeLink, now they both are aware of the issues and intend to correct it in the future, and we are aware of the risk of having our garage doors programmed and parking outside our homes.
But didn't you post below that you have to turn your key on to open your garage door?
As a public service, maybe you should have the garage door opener manufacturers notify their customers not to clip the remotes onto the sun visors.
If this was really an issue you've had heard about long ago, before there was any HomeLink. Garage door openers have been around for decades with no major problems ... until you see it on the internet.