They paired what was in the service with the long life spec etc. They want to quote prices below others. Thats where they delete things or put them outside of the plan as extras. The long service interval is like that to get the cost down for comparison but obviously if it's not as long as two years due to oil change coming up with reasonable etc.
That's why you do need to audit what the maintenance recommendations are against what's in the plan whether fixed or variable and the extras they haven't told you about that need doing. If you are changing the car after three years say, missing out on the extras bits not in the plan you can probably stumble through but the next owner not.
It was at 5 years I checked what they had done with what was recommended. Got the battery changed then as safety measure, one year over the four. 10 years I'll do another audit to see what's been skipped if not before.
Father was a flight engineer in the war on flying boats all stops Ceylon to Singapore and back once a week. Fitting new engines, take them apart etc. Pretty important to get back up off the water, no lay byes in the sky or breakdown recovery
. He did his own car mechanics. I passed on that but make sure the garage gets it right. My others brothers did get their hands under the bonnet.