Are You sure, You not pay for it anyway 
Yes, it depends, but most modern devkits have the sound built in, so scratch-off may be additional service. Yep, if there is a silicon-level new device, You’re right, then the design may take some effort.
Another theme is the software - of course the sound subsystem needs programming and bug-fixing. But from my personal perspective… in normal conditions, i look at screen, ~10 times per day, but my ears are open 24/7.
What’s about my laundry, then i personally do not have problems, already have some speaking device, announcing additionally about many things, for example snail-mails.
Khmm, yep, this is an old version - from my Fibaro-days.
