Jonathon, realistically I think far too much importance is placed on this stuff.
If the grinds stick in place, and over time and due to their sticky nature, harden and encrust (and we see our fair share of this when servicing grinders of any brand and model), then these old grinds are not being flung out into the group handle to be used for the next coffee. Then they are probably not influencing any wet coffees being made at any particular time.
Myself and many others who use grinders on a daily basis to make many more coffees professionally than clients make at home, seldom pull the grinding plates to clean and when we do, precious little comes out. We dont leave coffee in our grinders indefinitely (as many cafes do to go oily and pasty), frequently change origins and blends and use a simple paint brush to brush out the inlet of the grinder between origins with a relatively clean/clear flow path.
Its all in the management technique. If you do pretty much the same, and happened to find encrusted grinds under the bottom plate, does it mean anything?
Take care not to over analyse and make the act of coffee making too difficult to enjoy !