I've got carbon, a dropper, long travel forks, 150mm rear suspension, short stem, wide bars (high rise though). I suppose my next bike will probably have 650b - not fussed either way with that one.
I'm clinging onto tubes though for now - never tried tubeless, just haven't got round to the faff.
The big one for me is a triple chainset - until I get to try/can afford 1 x 11 and find myself convinced, the triple is staying for me.
So which bit of your bike does the luddite cling on to?