I tried tubeless and gave up (2 side wall gashes that needed a boot and a tube to get home in 5 rides) so went back to tubes.
Never tried discs.
Rode 3 cyclo-cross races this year (for the first time in over 45 years). The race I did best in was the wettest and muddiest event of the 3 with more technical descents and demand on braking. I rode a Surly Cross-Check with linear pull rim brakes and pink Kool-Stop pads. I didn't seem to be at a disadvantage to all the disc brake riders and stayed on the bike without crashing as a result of inferior brakes. I only saw one other rim -braked bike in the race, a lovely classic Ritchey. However, if I needed a new bike I'd probably get something with discs because that's what manufacturers are flooding the market with.
The other upgrades are possibly more relevant to the racing community.
When I was racing (late 70s/early 80s) I looked for technical improvements that may have given competitive advantage but, now as a leisure cyclist, I'm not someone who upgrades for the sake of it and ride components until they're worn out or need changing.
A new bike seems unlikely in the next few years.