I bet even with 50/34 and 11-34 gearing you’ll be grinding away when the grades are over 12% grade or so. So not overkill if people are expecting 10%+ grade climbing for any sustained period of time.
For example I recently had a day trip to the mountains and the second climb was 8% avg with many sustained 10-12% sections. I had the equivalent of a 50/34 and 11-28 and was wishing for 1-2 more gears on the steeper parts while averaging 4.4wkg on the climb.
This site is great for comparing different cassette / chain ring options against your current setup: http://www.gear-calculator.com/