Common key for all external doors.
Doorbell camera so if for example a courier rings your bell you can speak to them via WiFi from anywhere with instructions to leave in xyz location, with a neighbour or redeliever.
Zoned heating so if fuel prices keep going up you can have warm zones rather than heating whole house. If radiators used thermostats valves on every radiator.
Heated towel radiators near every bath/ shower with integral electric element so you can dry towels on it in summer if main heating is off.
Lots of light switches so you can turn lights on off from where ever you need. We have landing light light switches outside each bedroom so who ever gets up first/ goes to bed last can turn lights on/ off.
Lots of sockets many with usb points for devices.
In our last house, with very thick internal and external stone walls, we also wired for intranet when wiring the house (that was a back to bare walls house true full renovation though so logistically very easy and cheap to add).
I do love boiling/ near boiling water taps.
I don't know that I'd have a hob in a new kitchen. I think I'd get one or two portable induction rings and keep them in an appliance cupboard. Likewise I dont think id bother with a big ceiling fan over the hob.
I'm a complete convert to hydroponics and have a smallish salad/ herb set up with led daylight simulator bulb above semi built into a cupboard in my dining kitchen. Fresh salad, herbs, watercress daily year round. It was all from IKEA and I'd definitely factor a couple of these into the design of a new kitchen. The DC love it too. It's great to always have fresh mixed leaves to pick and throw in a wrap or make a fresh salad.