For those not familiar with the title phrase: CodeSmell

Although IMO "Are many use statements a code smell?" might be a better title.

And to add an answer, usually when ive had to do this i usually end up putting all the use statements in the root class. So the client says

use Stu;
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And all the subclasses are pulled into memory. But i dont have startup time constraints. Its fine for my code to chug a little on startup as it usually runs for hours anyway. YMMV.