[int_19h]

It's a very big step in a language with nominal typing. Tuples with named fields are compatible (even across assemblies, if I remember correctly) so long as order, names and types match. Structs are not compatible in that manner.

[Digit-Al]

Nice point. There's also the fact that with deconstruction being added as well, you don't even have to have the overhead of declaring a struct variable to get the return value and then dereferencing the fields, you can just deconstruct the tuple into variable if you so wish.