Shingle crazing are hairline cracks. The laminated asphalt layering is drying and shrinkage has left cracking or crazing lines on the shingles surface.
The photos you provided shows different shingle styles. Laminated Dimensional shingles RIGHT first 2 are asphalt 3 tab.
To make recommendation a reinstall is premature.
Although worn in appearance, they may still last 10+ years of useful life span left…***
Report on condition only.***
ASPHALT AND DIMENSIONAL LAMINATED ARCHITECTURAL SHINGLES ARE CRAZING.
Crazing is when the asphalt used to apply the last protection layer over the organic felt and asphalt layer for the mineral granules shrinks due to poor quality control.
I see no lifting, cup or curling condition.
No reason for alarm in the photo.
RECOMMEND: Licensed roofer evaluate the condition only.
Maintenance; Water and weather tight using a bitumen asphalt base plastic cement compound all open voids and insure all caulked areas have been made water and weather tight.
Caulk att tin and metal flashing.
Repair and replace any broken or missing shingles.
Reset and nails that have risen.