For some context, Bitcoin’s consensus mechanism, Proof of Work (PoW), (theoretically) favours decentralization and security over scalability: BTC is permissionless, so anyone can participate in mining or run a node and the security of the network is protected by the price of energy/hardware needed to produce the accumulated hash power.
Satoshi’s original vision as he personally described it to me: “The current system where every user is a network node is not the intended configuration for large scale. That would be like every Usenet user runs their own NNTP server. The design supports letting users just be users. The more burden it is to run a node, the fewer nodes there will be. Those few nodes will be big server farms. The rest will be client nodes that only do transactions and don’t generate.”