"Future Proof" is simply marketing. As others have already pointed out, simply being able to replace a board doesn't mean there's going to be one made to do it.
And yes, there are big differences in DACs, age being a consideration, along with implementation before and after it (probably the most important and least talked about because its not as sexy as whats the best DAC chipset and how many bits: its like the old horsepower wars with cars-those ratings were quite misleading but it made for great copy and people fell for it by the truckload, and still do).
And yes, there are big differences in DACs, age being a consideration, along with implementation before and after it (probably the most important and least talked about because its not as sexy as whats the best DAC chipset and how many bits: its like the old horsepower wars with cars-those ratings were quite misleading but it made for great copy and people fell for it by the truckload, and still do).