One Lens Travel Setup for the Next Decade - Feedback Needed

I am a non-professional photographer looking to buy my first 'professional' camera. I want elite image quality that will stay relevant for at least 10 years. I shoot a mix of everything: travel, family portraits, nature, and animals. Thus, I want a versatile god-tier lens that should last a decade. I'm ok with upgrading the body (e.g. r6 mark IV in the future)

I’ll buy all the equipments at Yodobashi Camera (Japan) in May 2026.

​The List:

​Body: Canon EOS R6 Mark III

​Lens: RF 24-105mm f/2.8L IS USM Z

​Storage: Delkin BLACK 4.0 CFexpress Type B (512GB)

​Power: 2x Canon LP-E6P Batteries (shooting dual slots with a V90 SD for backup)

​Carry: Peak Design Everyday 30L + Slide Strap + Capture Clip v3

​Protection: B+W 82mm 007 Clear Filter + Gramas Extreme Glass (LCD)

​Cleaning: Giottos Rocket Blower + Hakuba Microfiber

​Specific Questions:

​The Weight: Total rig is ~2.2kg (4.8 lbs). For those who use the PD Slide/Capture Clip, is this sustainable for 9+ hours of city walking? I'll keep the camera in my backpack during transits and won't be walking non-stop but I want to last a day. Is it doable?

​The "One Lens" Bet: Does the f/2.8 Z-series truly replace the need for primes for a generalist, or will I regret not going for the 28-70mm f/2?

Thanks in advance!