household - Why don't all washing machines beep when finished?

I've owned several dishwashers, and they all beep loudly several times when they have finished a cycle. Not that I care, because I don't need to rush to open them and grab the clean plates. Usually it beeps at 3am and I sleep through the noise.

But when my clothes finish cleaning, I do need to rush to open the washing machine straight away, because everything gets creased otherwise. I want to hang it up quick! Yet no washing machine I've ever owned has beeped when it finishes a cycle. Apparently they exist, as some people have posted below. But why not all of them?

It is true that I am alerted to the approximate time a cycle ends, because of the loud noise of the spinning drum. But I haven't memorised the length of this period, it can vary in duration, and I get distracted every time by what I am doing. The silence when the spinning ends is not a noticeable event which makes me realise the cycle might be over. Anyway, there are several periods of spin/quiet/spin/quiet.

So why don't all laundry appliances beep? The electrical components to achieve this cannot cost more than 1GBP. The machine's microcontroller already knows when the cycle ends as it has to begin a door-unlock timer, and change the LEDs displayed. It seems crazy they don't beep.