That's the key if, and that's what is now changing.

When you try to calculate how many people can "own" bitcoin it increases when you change your assumptions from 1sat/vb to .1sat/vb

Increasing users = scaling

Many such cases, if you can afford 1sat a byte you're more sovereign than someone that can only afford .1, same is true for 10sat vs. 1sat.

We have no idea what the market will settle on for fees in another 15 years, entirely possible that requires 1000sats/vb to get a tx confirmed.

Yep, whether its dust in the literal sense or practical sense, the supply of <2.1q divided by that amount is the scaling limit in terms of ownership.

When I say it's the final scaling frontier that means its literally the last thing possible from a technical perspective because the supply isn't going to change and distribution/fee rate is a purely market function.