Drains here are modern and sound, so a blockage is nearly always something that went down the pipe rather than a problem with it.
The usual causes
Cooking grease in the kitchen line, hair and soap in bathrooms, and wipes labelled flushable that genuinely are not. None of these mean anything is wrong with your plumbing — they simply need clearing, and then keeping an eye on.
Long runs in larger homes
Bigger floorplans mean long drain runs with gentle falls, so material has more opportunity to settle along the way rather than being carried straight out. It is why a large newer home can develop a recurring kitchen drain problem despite having perfectly good pipe.
Hard water adds to it
Scale builds up inside drain lines alongside grease and soap residue. Jetting removes that coating properly where a cable would just pass through it.
Construction debris
Occasionally a drain has never run properly since the house was built, because something was left in the line. If one particular drain has always been slow, that is worth looking at with a camera rather than clearing repeatedly.