Let us know how you find 12 spd mechanical!
My previous bike was spec'd with Shimano Claris 8 speed, and let me tell you coming from that 12s seems excessive. I honestly think 10 speed is probably all you would ever need, so I would guide the forum to save money and buy the now "old" 11 speed groupsets at lower prices. The 11-34 cassette is absolutely ridiculous, and once it wears out I will be going down to a 11-30. Previous Claris cassette was 11-28, and I was able to make it up all the mountains here in east TN. What is nice with going from 8-12 is that the jumps between cogs are much smaller, which I never realized would be that big of a deal. I feel like the only time I would ever use the 34T is if I was bonking hard