The time based maintenance guide may not appeal to infrequent drivers but it is necessary for the daily driver the drives short trips.
Driving 3 miles each day pollutes the engine oil nearly as much as driving 30 miles each day but the former would take almost 3 years to accumulate 3000 miles, that is far too long to go between oil changes. The primary service in the 5000 mile/6 month service is the oil change. The tires and brakes should be inspected every 6 months for your safety.
If you only use a vehicle twice a month for grocery shopping you may choose to stretch these limits, most vehicles are driven daily and the maintenance schedules are meant to suit the majority of owners. If your vehicle is parked in a museum you need to make your own maintenance plan.
A secretary at work drove a 1998 Dodge. About 10 years ago I reviewed the maintenance history on that vehicle, she had been changing the oil every 3000 miles/once a year. She drove the vehicle at least 5 days a week to work, she must have lived close. It seems that none of the service advisors warned her the those engines can’t handle that type of neglect, the engine seized in 2015. On the positive side, 17 years from a cheap car isn’t bad and the money saved on oil changes went towards a better car.