>>1292186>Why are [INSERT FRAME MATERIAL AND/OR CONSTRUCTION TECHNIQUE] bicycles so aesthetically pleasing?
Fixed that for you.
Calfee pioneered using bamboo as a frame material.
Many manufacturers use titanium alloys, aluminum alloys, combinations of aluminum and carbon fiber.
As materials science progresses, even more exotic materials will be made available for framesets.
A few years ago, something called 'structural aerogel', a material dozens of times stronger than steel but almost as light as paper, was developed, promising framesets so strong yet so light that a stiff breeze would blow it away.
Any 'aesthetic' of bike can be made using any of the above materials.
The bicycle in your pic could be re-created in the highest modulus of carbon fiber, have precisely the same look, but be much lighter and much more energy-efficient.
There is nothing 'magical' or 'special' about steel. It is merely iron processed in a certain way, and it happens to be easy to work with using simple tools, nothing more.
Perhaps your romanticizing about something not particularly warranting your sentiment is merely your subconscious desire to simplify your life? Perhaps you should consider looking inward, instead of trying to fulfil your inner desires with material objects, OP.