That is good. At times we can overcomplicate things and naturally the costs go up. I only have one sound loco... One of the first that came ready fitted into a Bachmann locomotive. Though the loco was a high price, I had the cash and wanted to try it to see what it was like and it is impressive but I then thought along the lines that even with a good job, if I started converting all my locos to sound,the costs were beyond me! (In those days I had money to spend..
). All one really needs from sound is the sound of the locomotive working away along with the horn or whistle, and the brake noise when one stops. (And a starting up noise for diesels). That is it basically. And if it means cheaper decoders to do this then there is going to be a larger demand then a more expensive decoder, though the more expensive version with extras will still find a market.
I'm actually surprised we dont hear more about DCC uncoupling as part of RTR locos, as we have movement, lights and sound.... One would have thought uncoupling would have gone ahead of sound development by now. I know there are one or two businesses making such devices. Just strange the main manufacturers have not adopted the idea. I saw in H0 scale that they did have DCC locos with uncoupling and even have opening doors when at a station a few years before sound became popular.