The team tig SL that I have been building since 1992 has had some changes over the years. Some of the things that were in the original are still there- stable handling and room for big tires.
What is relatively new is the front and rear thru-axles, tapered steerer carbon fork and full-housing zip-tie cable guides Of course, people can order whatever but here's a frame that really speaks to the current build. All the new features make sense, not just from the fact that manufacturers of bicycle parts are changing standards all the time but also to make a better platform for riding in the dirt . Disc brakes mean less hand and upper body fatigue, thru-axles mean a more secure attachment for the wheels. Yes, change can be a pain for a builder but when the result is a better bike, I'm all for it.