Safety has to be considered but.........
I'm currently playing with 6 Land Rovers plus the daily driver.
The daily wears tyres out, if I followed the 5/6 year guideline I'd be replacing a set of tyres every year on a Land Rover or having one set of wheels & tyres I swapped around depending on what vehicle I was using. "just heading off to the shops, I'll leave in about 45 minutes once I've changed the wheels...."
Manufacturers are playing safe, no chance of someone coming after them if they clearly state 5/6 years life and a tyre fails after this time.
"if this is too expensive for some people they shouldn't buy this type of vehicle to begin with ?" Really ? 
The tyres quite possibly don't need changing at 5 years anyway but it gives you peace of mind. If you can afford to prop up the local tyre fitters and the tyre industry that's up to you.
At the moment the law is quite clear and the 5/6 year replacement is just a guideline from the people who manufacture and sell tyres.
Colin
				
			 
			
		 
			
				
			
			
				'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
			
			
		 
	
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