Short service intervals were created to pass the buck from the manufacturer.
If you don't service it like they say & it goes bang then it's not their fault.
But short service intervals are nothing new.....
My KX 420 manual says I should be checking the big end every 5 Moto's
Assuming 45 min plus a lap then 5 moto's would be around 4 hrs riding.
So if I was to do it by the book back in 82 then at the 4 hr mark in the Wonthaggi 6 hr Pony Expess I should have stopped & measured the big end before finishing
I don't think so.
I never raced it in any open MX meetings, just a few club MX, the 6 hr & a few club Enduros & I used it for heaps of trailriding. Never took the top end off all year & I bought it second hand at the start of 82, But if I had done it by the "book "then I would have had to replace rings twice in the 6hr