Is the “natural fiber” rule a myth? (Cotton vs. Bio-based)

For the last few years, Ive stuck to one golden rule, all my clothes must be natural fabric with no other material blended in. Cotton, Silk, wool etc, I always assumed that if it came from a natural source, it would be best for the planet.

This is kinda a the more I learn the less I know moment for me tho, when I read about water scarcity and industrial cotton farming. The amount of water required to produce cotton is incredible. I also read that some synthetic, bio based material might be better for the planet. So Im not quite sure.

Some of the brand that I started wearing, Allbirds (their Trino line), Patagonia (their Tencel blends), and OGLs bio-cotton, I was drawn because of their close loop production, which seem to eliminate the majority of water waste. The water recycling rates vary, like OGL claims nearly 99% of water and solvents recycled, while others have different approaches. Ive noticed the textures differ too, comfortable to wear but with varying levels of elasticity compared to traditional cotton.

Am I crazy for starting to prefer these high-tech plant fibers over traditional cotton? Or should we stick with the philosophy that if it is natural, it is good? Whats everyones take on this?