Re:
Some more two peneth's
Bar ends - I use classic ones (admittedly small ones to save weight) on all of my retros. Its nice to be able to change hand positions as i suffer terribly with death grip. On my modern bikes i use Ergon grips with built in bar ends even on my 8.5kg carbon cross country rig. I'm also considering using them on my retros.
Wheel sizes - i love the 26" size but it does restrict at times now. All of my modern bikes are 29er wagon wheels, yes they take more effort to get rolling but i can use any tires i wish on them 700c road, CX tires, gravel tires and MTB.
Tubeless - I have to admit that i was a Luddite when its came to tubeless. But i made the switch in 2017 on my 29ers and have never looked back, instant puncture fixes, the weight saving, rotational weight savings....the list goes on. I did a ghetto tubeless on my fat bike this winter & i saved several KG, which on that lump of iron turned it into a different cycling experience. I am even going to be running 26" tubeless on my RC100 at this years Mayhem for those that want to crucify me
1 x drive trains - another luddite thing for me, but it is great, light weight, simple, low maintenance. Try it.....i may even do this to my RC100 for mayhem too. I'm getting older now and anything that makes a ride nicer is well worth looking at.
For all of the purists, the future is now, its also the past and there is nothing wrong with mixing it up.....get out there and ride. Ride for fun, not for show!!!!