... You know that we do have a categorization of clouds, right? I think meteorologists would disagree with you about the utility of that categorization.
More to your point: whether you can do something without a tool has no bearing on whether or not it is a useful tool. You can write programs in machine code if you'd like to, but you're highly unlikely to be as productive as someone using a high-level programming language. Similarly, you can program without a type system if you'd like to, but you're highly likely to end up with runtime errors that you wouldn't have had you used a type system.
Except when the type system restricts you to homogeneous data-structures in inherently heterogeneous world. Herbert Spencer, the philosopher, could tell us a lot about it.
As for crude and misleading clasdification - there is no shortage for them, especially in realms of psychology (hypohondric, sangvinic - all that nonsense) or economics and finance. The results of application of flawed economic/financial models based on flawed categories could be seen everywhere.
For meteorology, please, ask anyone who lives in monsoon area - there is worse than coin-flipping accuracy when it comes to hill regions.)
More to your point: whether you can do something without a tool has no bearing on whether or not it is a useful tool. You can write programs in machine code if you'd like to, but you're highly unlikely to be as productive as someone using a high-level programming language. Similarly, you can program without a type system if you'd like to, but you're highly likely to end up with runtime errors that you wouldn't have had you used a type system.