Perhaps instantaneous hot water is a solution to a problem that barely exists.
A bit like car keys. A long time ago - put the key in door, twist, get in, inset key into ignition, twist, go. Takes longer to read this than do.
We then had remote locking - some benefit over the old ways - opens passenger doors, door lock doesn't get frozen on frosty mornings.
We now have keyless to open the doors and enable the ignition. Eliminates the need to press on a small button on key fob. Starting engine - press start button instead of twisting key.
The price of automotive progress - to fix occasional failures or loss we have gone from a £5 key, through to £200+++ depending on which bit of the system has failed - key, fob, several ecus etc.
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