I suspect that most of them are too cheap to actually bother(unless it’s with things that make their lives easier on average; like some ill-secured management backdoor permanently on the WAN); but I can never tamp down a flicker of suspicion when I tell a surprisingly capable box full of firmware that probably hates me “so, just act like a dumb wire and/or rudimentary protocol translator” and it says “OK, I’m definitely doing that now.”
The difference between “bridge” and “zOMG So Many NATs” is quite evident. The difference between “bridge” and “mostly bridge, most of the time” would be a lot subtler.
