Only because at the moment the mempool is not clogged up, is not proof that a blockchain scales. A blockchain does not scale by definition / design. It's not made to do it and it's perfectly fine. It allows us to run it on a multitude of devices, at affordable prices and with pretty quick setup time (less than a week in most cases) which is essential for decentralization and security of the whole Bitcoin network.

For the record though, I'm not a promoter of big blocks, of faster blocks or of shitcoins as a scaling solution.

I'm instead a promoter of performing real Bitcoin transactions, but keeping the majority of them off-chain, that's a pretty simple and logical concept in my eyes.

You think I'm a propagandist? I'm just giving you obvious facts. Yeah, it's also a fact that Bitcoin is at under 4tx/s at the moment, but how is this proof that the number won't change? And do you want it not to change? Because I do want the number of Bitcoin users to go up; it's in my and their interest. So I try to look into the future optimistically and assume / hope we will soon have the need of 40tx/s, one day 400tx/s and maybe in a very far future 4000tx/s. That's why I'm trying to start building the infrastructure for such a future now, not when it's too late and the 'demand' for more transactions/sec. is way higher than the 'supply' Bitcoin can deliver.