If you go on big rides in the middle of nowhere then you can't really afford to have components fail on you. I always take a few tools, small parts etc. but if something like a pedal or stem fails I'm walking a long way home. Quality components are made of different materials (e.g. higher grades of Alu) and manufactured using better processes (e.g. cold forging, not stamped) so they are stronger and lighter. I also don't pick the very lightest components since I need durability.

Aside from that, the joy of riding is what gets me out. Many cyclists choose tough hill climbs for added fitness gains and challenge. There is a good kind of difficulty (steep grade somewhere picturesque) and a bad kind (unresponsive bike that doesn't roll well)

> middle of nowhere

I don't usually go to the middle of nowhere, most often I'm going through a bunch of towns. In the worst case I can shove the bus on a bike to get to the next town.

Time and time again I have found that failure happens even with the best of components, and having standard components means you can find replacements more easily. Having a steel bike means the village welding expert in a random town in rural China can fix the frame, or fix your broken rack. Having standard spokes, tire, etc. means the LBS in Burmese village (who unlike American LBS, are actually reasonably priced) will have parts that work with your bike. Having standard brake pads and cables means you can get them anywhere when they wear down.

Shittiest and heaviest bikes are really unpleasant to ride. And if you don't enjoy the ride, you don't ride.

Additional point: shitty bikes usually have really terrible geometries and will fuck up your health if you decide to use them for sport. If your shitty bike calls itself an 'MTB' and you take it onto a trail, it is very likely for it to actually break if you catch even a tiny jump (let's say 20-30 cm root) because the welds are terrible, and the metal is brittle.

I said it's good for your health, not that we're optimizing solely for health. You're right that the most frictiony setup could be beneficial.

But also, a higher performance bike will help you go further & faster. It doesn't mean you will end up exerting less effort, it just means that you will go faster and you'll keep putting in the same effort. With this time saving you can try new routes, feel more comfortable going further or bike packing with higher quality gear. It wouldn't change how long I ride for, but it increases the options for where to go.

Yes there are diminishing gains as with anything, but an entry level bike is still going to be below the Shimano 105 point of performance vs cost.

Greg Lemond said that "it never get easier, you just go faster." A nicer bike isn't going to mean that you work any less hard, it just means you go faster. And fast is fun.