It's a ****ed if you do, ****ed if you don't kinda situation.
It sucks to spend a lot of time or money checking a tolerance, only to find that it is in spec.
Equally, it sucks to not do the job and find later that damage has been caused due to Mal adjustment.
If valves are out of adjustment, you can start to see I'll effects on the efficiency and longevity of your motor.
Exhaust valves that don't completely close, don't dissipate heat through the valve seat to head transfer and thus can overheat and burn. Expensive.
Having said this, I must admit that it is a job that I have skipped, more than once, due to the increased complexity of modern valve trains.
Lock nut and grub screw adjustable rockers are very simple and easy. Bucket over shim, not so simple.
Variable valve timing adds another level of complexity, again.