An excellent point but should people adjust their expectations?
I don't expect something so small to sound the same as a full size equivilent because it isn't a full size version. Just like when trains are going round, I don't get the vibration or woosh of wind or many of the other things.
It's just a compromise.
Which is the same with sound - and that comes from a semi-audiophile who wants quality over anything else when it comes with sound.
I don't expect studio quality or proper balance from a tiny model train but saying that, I do want as much quality as possible from such a small sound unit. And what is being produced in the last 6 months with that regard is pretty good.
Personally, I don't consider a loco if it isn't DCC.
And if there's no sound option, around the time of ordering I look to see whether there is a sound producer or if it's planned by someone.
If the model didn't come with sound, I would be a little put off as I want that option and I am happy to pay more for it. But then my budget allows me to do that - I see some people blowing over £2000 on 20 Class 66's where as I am happy to pay £300 for one sound loco.