I haven’t watched the video yet so Andy may well have covered this but in my garage we do what the manufacturers schedule says. Simple as that although obviously when checking brakes, suspension etc. we also undertake to carry out any repairs/replacements necessary AFTER consulting with the customer.
But I’ve seen too many places who change, as an example, the fuel filter every year when it might be on a 40,000 mile service interval but never change the brake fluid or cabin filter.
A standing joke in my area with one supplier is when a particularly rubbish local garage owner (since left the business thank God!) phoned in and asked for a “full service kit” for a car one of the staff said “What’s he want then? A litre of oil and a clean rag?”