Contact Sheets for Tacky Rubber

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I’m trying to understand the significance of using a contact sheet with tacky rubber. Is the purpose of the sheet just to protect from dust during storage in a case? Or does it serve some other purpose beyond that? Will tacky rubber lose its tackiness without a proper contact sheet?

Also, I’m using a sheet of Dignics 09c. The adhesive style sheet that it came with was too sticky and kept getting gross residue stuck to it so I switched to using a regular (non-adhesive) contact sheet that came with a Yinhe Jupiter II rubber (“maxtense” contact sheet). Is that good enough to use?
 
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