Ten years ago, Macbook Pro was equipped with 4GB RAM. Back then, the Macbook Pro hardware led the PC industry. Pro is a real Pro. today, you’re saying that it’s enough.
macOS market share is actually 20% on desktop/laptops despite Macs selling only about ~8-10% of total PCs worldwide.
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So that's older Macs still in use and doesn't mean that the current 8GB Macs is still trending that way.
The lifespan of a Macbook Pro will be increased if the RAM is upgraded from 8GB to 16GB, which is very unfriendly to the environment. Ironically, Apple's official website makes a big deal about how low-carbon they are.
Note: Customers cannot upgrade the RAM by themselves.