Where the APIs are compatible anyway, but only the names or order of arguments are different, it sure would be nice to have a standard so you didn't have to look up whether it was count or len or length or size.
Maybe one person creates various functional wrappers around the array structures to make composition of length or count work in their functional programming design. Someone else created mixins and their own derived classes that solve it with OOP designs, etc etc. Someone else only uses Jax and doesn’t care. Someone else uses infinite streams on top of these and so they never need length or count.
Forcing the same call semantics on all these users doesn’t make sense. Let them build their own abstractions if they need to standardize semantics for their use cases.