For commercial landscapers or someone who has a side business doing landscape maintenance like me, grass clippings sticking to the deck do cause an issue despite what others say.
It causes the air flow or vaccuum that is created by the blade(s) spinning to decrease. This causes longer grass that is bent over to not be sucked up straight while being cut. Then you have an unfinished appearance and "stragglers" left throughout the lawn.
As far as "homeowners" are concerned, this might not be an issue. It may be amn issue for homeowners that want a nice manicured appearance such as the op of this thread. At least that's the indication I get.
If you want a product that commercial guys use and I have used too, try this out. It works but its something you have to stay on top of. If it's just your yard that you're cutting then you can go longer. It was a pain to spray my 36" deck over and over so I just put it on jack stand and use a scraper to get all of the **** off.
In addition, depending on how long you let that wey grass sit uup in there and then it dries, any chemicals or fertilizers that you use are basically being pressed into your deck and trapped between the deck and all that caked on grass. After a while it could cause rusting.
Fluid Film® | Corrosion Preventative, Lubricant and Rust Inhibitor
Fluid Film® | Corrosion Preventative, Lubricant and Rust Inhibitor