It took me by surprise too. My guess is that most simply use Bitcoin as a savings vehicle, which doesn't require too many on-chain transactions. Personally I probably make 1-2 transactions per month (exchange withdrawals, channel management), with everything else done on Lightning.

Ordinals / transcriptions on the other hand demand a heavier on-chain footprint, so it doesn't take as many users to consume blockspace and jack up fee rates. It also attracts gamblers who perhaps don't care so much about paying excessive fees. And because NFTs and BRC-20s are so new, not many exchanges support them to handle trades off-chain.