> I wasn’t comparing 6/7/8 with 10 and 11 but with 1 speed.

I covered 1 speed in my earlier comment (“single-speed”) too. There are some nice graphs at https://zerofrictioncycling.com.au/chaintesting/ (although that testing doesn’t cover single-speed chains).

> As for the chain you might be right, but a well maintained chain over time needs more work that many wants to invests.

Right! Totally reasonable to prefer not to maintain a chain.