Block space and coinjoins
Block space as bitcoin adoption increases will become more and more expensive.
Coinjoins for small amounts will not make any sense due to their high cost at layer 1, coinjoins in a high fee scenario loses all appeal.
Discussion
So we need to fix this by making coinjoins unnecessary by making BTC private by default.
That's not possible without some serious tradeoffs.
WabiSabi coinjoins were designed with this blockspace constraint in mind. You can make a payment directly to its destination in a coinjoin transaction: https://github.com/zkSNACKs/WalletWasabi/discussions/10570