The Good old mowers like this Greenfield were used a lot by schools and councils when they were new.
The newer mowers with PTO Clutches aren't great in a dirty environment .They are made to be replaced though.
I don't think most people are going to look after the PTO clutch in newer mowers.
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How to Reduce Dust Damage on PTO Clutches
Blow off the deck and clutch area after every mow (compressed air works best)
Donβt engage PTO at full throttle
Avoid mowing in extremely dry/dusty conditions if possible
Check for deck seals or guards to block dust kick-up
Lubricate and inspect clutch mechanisms if applicable (some have serviceable bearings)