why is plate NonModulable?

[selfsimilar]

I am very new to sound coding, but my first instinct when playing with the examples was to slowly increase or decrease the reverb/plate effect over time programmatically, but afaict because plate takes a single parameter mix that is NonModulable, I can only provide a static value for any plate nodes. Am I understanding this correctly and what is the design rationale for implementing the plate node this way?