...A lack of gauges these days especially the engine temp gauge. .......
I worked in the car industry for many years. Temperature gauges, and especially oil pressure gauges, are a complete waste of time/money/effort. If you engineer a car properly they are of no use, the temperatures will be OK and the oil pressure will be fine. Very often the gauges were calibrated in a very non-linear way anyway, the water temp would usually sit near normal on the gauge pretty much regardless of actual temperature. Mind you, in the old Mini/Metro with the A-series it would eventually let you know when (not if) the bypass hose had failed. Modern cars properly engineered .... no.
At least in a modern car it would be perfectly possible to display on a screen any parameters used by the engine management system if you really wanted it. Less is usually more.
Things that bug me, with many electronic/IT type stuff not just cars, is how complicated it is to set stuff how you want it, selecting menus scrolling through options selecting sub-menus etc. Usually I've forgotten how to do it next time I need it.
One thing that I liked in the Jazz is the nice big round knobs for the heating/ventilation. My Yaris has a small mode button to select where the air is directed (screen/footwell etc) and I always have to look down low on the centre console to find it, hate that, but the ventilation is actually better than the Jazz.
In the Jazz the dashboard reflection in the screen is awful, how can that get through to production? I have a mat on the dash but you shouldn't need to.
Silly door handles bug me too, and as for those scrolling indicators used by some manufacturers, don't start me.