Great topic. We check every roof for this, and other shingle issues. The problem is, some defects do not always appear right away. Granule loss can sometimes show up, but other times do not always show up for a few years.
That being said, when you walk on over 600 roofs a year, you usually can always find or even "feel" on your feet a roof that is an anomaly.
The problem with checking for shingles sealing is that that it is difficult to check HOW sealed they are. Typically, if a shingle is sealed we cannot lift them up with our fingers....they are well stuck to the shingle below, as designed. We do not take a pry bar and check the seal...that would "break" the seal and be invasive.
You can also have times where the shingles have sealed, but a major windstorm can "break the seal".
In short, we check multiple shingles for a good seal on every side of the roof. 99% of the time, they are found well sealed.
Hope this helps!
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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