I'd only go down that route if there was a genuine cost/benefit gain, i.e. a pay back period within a realistic timescale. I can see the appeal of solar panels (again if you're going to get your investment back within, say, 10 years), but not all the lazy gimmicks such as mood lighting, central lighting controls, etc if they're going to cost a lot to install the infrastructure. You can save energy simply by using LED bulbs, and if you want gimmicks, buy the ones you can control via a phone app for dimming and colour change (which still use normal wiring and are simple/cheap to replace).
The more "gimmicks" you have, you don't just have the upfront/infrastructure costs, but you also have more potential points of failure which undoubtedly will cost a small fortune to fix!
Personally, if I were to do a rewire, I'd concentrate more on thinking about planning for traditional switches, sockets, lighting points, dual usb/traditional socket points, wiring installations for potential wall mounted TV's, so more double sockets all over the kitchen, and plenty of doubles around living rooms, bedrooms, etc., maybe better lighting circuitry for fitted wall lights, switches by the bed side to turn off main light, switches top & bottom of stairs for hall and landing lights, wiring and switches for external security lighting, etc. To be honest, I'd have enough to do to plan for normal power/lighting/security without thinking of gimmicks on top! It's our one big regret not to have our home rewired when we bought it 25 years ago as we've had to make a succession of "small" tweaks over the years for traditional power/lighting needs, which has been costly and disruptive (i.e. carpets/flooring up several times for additional lighting/socket installations downstairs!).