Originally Posted by Brian B-P
More features have appeared, but mostly in the display and controls - basic functionality changes little, and the connections to the tug and trailer haven't changed at all.
Exactly! And especially in the functionality department.
The supposed innovations are as you say mostly bells and whistles that contribute little to function but greatly inflate the cost.
Perfectly adequate brake controllers can still be had for under a hundred dollars, but folks seldom point out how little the extra cost of more expensive "new/improved" ones equates to performance benefits.