Exactly. Perfect tight gears for flat terrain, a low for mountains and middle aged spread, and no ADHD shifting between rings with too little overlap. I've been doing that since 1997 after realizing 50-40-30 x 13-21 8 cogs yielded a 13-19 straight block for the plains east of Boulder, CO and low like 42x28 for the mountains west apart from the failed 50-34x13-23 9 cog compact experiment.